REPAIRING / SERVICING TV TOSHIBA 32L5865

Technical description and composition of the TOSHIBA 32L5865 TV, panel type and modules used. The composition of the modules.

TOSHIBA LED
Model: 32L5865 32L5865EV

Chassis / Version: RSAG7.820.7924

Panel: JHD315S1H71

LED backlight: CRH-BT32S1303006027ADREV1.2

LED driver (backlight): integrated into MainBoard

PWM LED driver: HOZ1GN (AP3843C)

MOSFET LED driver: CS630A4H

Power Supply (PSU): integrated into MainBoard

PWM Power: OZ531TGN

MOSFET Power: AOB7S65L

MainBoard: RSAG7.820.7924 / ROH

IC MainBoard: CPU: MT5659DUHT, eMMC: THGBMBG5D1KBAIL

Tuner: SCTS2-85 / 116H-FJ4 / ROH

Control: IR: RSAG7.820.7934, WiFi: ZDWFM2402 M2652_V1.00

Specifications 32L5865EV
TOSHIBA 32L5865
General recommendations for TV LCD LED repair
Possible manifestations of defects

- TOSHIBA 32L5865 does not turn on, indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.

In such cases, the main power source may be faulty - the AC / DC converter of the mains voltage, which is combined with the MainBoard RSAG7.820.7924. It is then necessary to measure its output voltages and, if they are absent, the power switches (AOB7S65L) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) OZ531TGN are usually checked by replacing them with new ones, or knowingly working.

- There is no picture, but there is sound and all other functions work. Sometimes when you turn it on, the image appears and disappears for a second.

As a rule, in this case, the backlight of the LED panel is faulty. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or open circuit), sometimes in the violation of the contact connections of the CRH-BT32S1303006027ADREV1.2 LED strips.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.

In cases where TOSHIBA 32L5865EV has no picture, but there is sound, the display backlight often does not work.
In LED TVs, the LEDs inside the JHD315S1H71 panel are usually faulty, and less often the LED driver.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.

Replacing the LEDs requires disassembling the JHD315S1H71 panel. We do not recommend such works on their own to TV owners and craftsmen who do not have experience in repairing LCD panels, especially at home.

If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and on an open TV, the light is visible through the holes in the panel case.
In this case, the T-CON (Timing Controller) board may be defective, but often the MainBoard RSAG7.820.7924 is also defective. A software failure is also possible. The panel may also be faulty - damage to strips, loops, for example, after moisture ingress. In such cases, first of all, it is necessary to check the panel supply voltage at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for column and line drivers - VGH, VGL, Vcom.
If they are within the normal range, then the oscilloscope needs to track the passage of LVDS signals from MainBoard RSAG7.820.7924, as well as synchronizing signals to loops with drivers.

Flooded screens of LED TVs can sometimes be repaired if no significant damage has formed in the loops and on the panel trims.


- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.

Repair or diagnostics of the RSAG7.820.7924 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: MT5659DUHT, eMMC: THGBMBG5D1KBAIL with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.

If you suspect a malfunction of the SCTS2-85 / 116H-FJ4 / ROH tuner, first of all, you need to make sure that the software is correct, as well as the presence of the required supply voltage levels and pulses of data exchange with the processor via the I2C bus on the corresponding tuner pins.

Owners of the 32L5865 TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!


DOWNLOAD SCHEMATIC DIAGRAM  / POWER SUPPLY   ------------------>   RSAG7.820.7924 Power supply

The appearance of the MainBoard RSAG7.820.7924 is shown in the figure below:

RSAG7.820.7924

The main features of the TOSHIBA 32L5865 device:

Installed matrix (LED panel) JHD315S1H71.
To power the backlight LEDs, a converter combined with the RSAG7.820.7924 main board is used, controlled by the HOZ1GN PWM controller (AP3843C). The keys of the CS630A4H type are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter circuit using OZ531TGN microcircuits and AOB7S65L power switches.
MainBoard - the main board (motherboard) is a RSAG7.820.7924 module, using CPU chips: MT5659DUHT, eMMC: THGBMBG5D1KBAIL and others.
The SCTS2-85 / 116H-FJ4 / ROH tuner provides reception of television programs and tuning to channels.


LED TV TOSHIBA 32L5865EV with LCD display, diagonal size 32 "(81 cm) 16: 9. The required brightness of the screen 275 cd / m2 is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1200: 1. The LCD panel uses Direct LED backlighting.
The design and capabilities of the TV realize HD picture quality at a resolution of 1366x768 pixels in 720p (HD Ready).
The 32L5865EV TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Internet connection can be made via Wi-Fi wireless connection. Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, HDMI x2, USB x2, Ethernet (RJ-45), Wi-Fi. A headphone output is provided. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.

Dimensions: with stand 734x465x171 mm, without stand 734x440x76 mm.

TV weight: with stand: 4.4 kg, without stand: 4.3 kg.

Attention! The panel of the TOSHIBA 32L5865EV LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!

It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable. 

REPAIRING / SERVICING TV TOSHIBA 23PB201EJ GREEN INDICATOR ON - BLANK SCREEN

 Toshiba 23PB201EJ
Plugged in electricity …… the green indicator is on ……
The BL lamp has also been on …… but the screen is blank …… .. there is no OSD appearance.
If you leave it for a while… ..sometimes the BL lights go out for a while then turn on again ……… and so on over and over again.
Try checking the Tcon voltages ... the results are present ...

Try FLASH….
The results do not change….
Check the dc-dc voltages… ..5v, 3.3v, 2.5v ALL present….

Observe the motherboard….
Tuner that is used type …… .TDSS-G221D …… ..
Tuners of this type are most likely to have problems …….
Try removing the tuner ...
 ... ... the screen can come out "blueback" ... and the OSD can appear ...

This type of tuner can be replaced with the TDSS-G224D equation type.

Or replaced by the TDSS-201D type with a few modifications as shown.

TOSHIBA 22DL704B OR ANY TV REPAIRING DEAD, NO ST-BY LED WITH A TV PSU VESTEL 17PW80

AN EASY VESTEL FIX, WORTH CHECKING IF YOU HAVE ANY DEAD TV WITH A VESTEL 17PW80 PSU.

  found zero virtually zero power going to the main board and the screen controller kept tripping.

  checked the capacitors for the usual bulges etc but they appeared to be fine.


There are 5x large diodes, just below the caps in the secondary section of the power supply. Soon found the fault:





Lift one of the legs on the first 3x – D708,D709 & D710.

Then check them with a meter – I found D710 to be shorted.


I would recommend replacing all three – you looking for a 200v 3A UF5402, easily available  for SMALL MONEY
 I would also recommend replacing all electroytic capacitors as well !


Simple fix.


Schematic diagram ----------->  Power Vestel 17PW80 Schematic diagram

PANASONIC TNPA4221AK SMPS AND TOSHIBA PCG33 TAPE DECK STEREO SCHEMATICS

 Toshiba PCG33 Stereo Cassette Tape Deck  and  Panasonic TNPA4221AK SMPS schematics (Circuit diagram)

 Panasonic TNPA4221AK SMPS 

Used ICs  IC406  L6561, IC409  MIP3E3, IC501  M34509G4FP, IC510  BD9703FP, IC520 LSSK0087

Used in models  TH-42PH10AK, TH-42PH10AS, TH-42PH10MK, TH-42PH10MS, TH-42PH10GK, TH-42PH10TS, TH-42PR10A, TH-42PR10G, TH-42PR10M

Block diagram

Schematic diagram

Tape Deck Stereo Schematic Toshiba PCG33 Stereo

Used ICs: HA12058NT, TA7639P, TA7341P, TC9310N, LB1406, TA7354P, TD62193P

TOSHIBA 32L2800, L32-40-43-49S4900FS NT63 POWER BOARD SCHEMATIC ELECTRIC DIAGRAM, SOFTWARE UPGRADE, AMP SECTION CIRCUIT DIAGRAM

 

CHECKING THE SOFTWARE VERSION.

- With the TV on enter the Factory menu

- In the Factory menu, check if the software version installed is correct.

Main SW update via the User Menu

- Download the compressed file update.zip, change the name and extension to “V8-N563T01-LF1Vxxx.bin” where xxx is the version number.

- Save the file to the root of a USB device.

- Connect the USB device, with the software, to the USB port.

- Select MENU Support Update. of ware via USB.

- The device will find the Vxxx software. Press “Update”

- The update will start. After approximately 4 minutes the TV will automatically restart.

- After restarting, perform the reset by going to the settings menu “MENU (key) System Restore Mode

Factory. Confirmation and password request is requested. Enter 1234 and press "OK".

- After this the TV will restart.

Note: The version of the So ware to be used must be the one informed in the material plan of the respective product.

After approximately 4 minutes the TV will automatically restart.

UPDATE WHEN THE APPLIANCE HAS NO VIDEO

- Save the file to the root of a USB device by renaming it as “update.zip”.

- With the device disconnected from the mains, connect the USB device, with the installation software, to the USB port.

- Press the TV's Power key and keeping it pressed, connect the TV to the mains

- The update will start. After approximately 4 minutes the TV will automatically restart.

- After restarting, perform the reset by going to the settings menu “MENU (key) System Restore Mode

Factory. Confirmation and password request is requested. Enter 1234 and press "OK".

- After this the TV will restart.

PROJECT ID CHANGE

(If panel information is wrong)

If the screen is completely dark due to the difference in panel x installed ware, press 062598 + MENU + xxx (xxx: Panel ID)

After the update, the TV will enter TV mode and the channel that was previously selected. Enter the menu factory settings again, select option 3 - Reset Shop, press enter.

After the reset, switch on the device using the power key.

PANEL TEST MODE (WARM-UP)

Recommended for analysis of panels (spots, dots, scratches, etc.).

Enter the Factory Menu as indicated before, turn on the "Factory hotkey" option and turn on the "WARM-UP" function.

A sequence of screens in different colors will be generated where it can be verified in more detail, possible failures the panel.

VERIFICATION OF AUTHENTICATION KEYS

In the same “WARM-UP” mode, a table with the main product information will be displayed in the corner bottom right.

In this table we have the project information:

We have the project ID, as shown in the table above and then the version of the software in use.

Below the information of the recorded keys (MID):

MAC (Mac Address) Without recording this key, it is not possible to connect to the internet network via ethernet (LAN);

DID (Device ID) Factory Control of the product; Already included in the main ware.

ESN (Ne lix) Without the recording of this key, it will not be possible to access the Ne lix services;

HDCP Without recording this key, high definition images from the HDMI inputs will not be reproduced;

HDCP2.0 Without the recording of this key, high definition images via wireless will not be reproduced;

IMPORTANT NOTE: If some of the keys are not recorded, the information “NULL” will appear in substitution the respective key in that line as shown in the image on the right.

In this case, SEMP TCL support should be contacted for instructions on recording procedures.

To EXIT the “WARM-UP” mode, press the POWER key on the device because the control functions remote will be disabled and if the device is just disconnected from the network, the “WARM-UP” mode will return when connected to the network again.

After exiting WARM-UP, enter the factory menu again and turn off the Factory Hotkey option or give a user reset.

Power board schematic

ENTRY STAGE

CONVERTING STEP

BACKLIGHT CONTROL STEP

AMP USING  AD82587

PHONES OUTPUT - AMP AND CONNECTIONS

TOSHIBA RT 6015 STEREO RADIO CASETTE RECORDER - DIAL CORD RESTRINGING - WIRING DIAGRAM – SCHEMATICS OF MECHANISM AND CABINET EXPLODED VIEW

 Used ICs: TA7358AP, TA7343P, TA7757P, TA7233P, TA7668BP, TA7233P, TA7343P

Dial cord restringing

Tight up the dial cord for the designated length, and cement after two ties.

Hook the dial cord to the spring and pass through the opening of the drum from the inside.

Turn the variable capacitor fully clockwise and mount the drum onto it.

[to prevent the variable capacitor from damage, slightly return it in the opposite direction and fasten the dial cord.]

Wind the dial cord in numerical order as illustrate.

Turn the variable capacitor fully counterclockwise and set the pointer to the “0” position in the dial scale.

Wiring diagram

Schematic

Mechanism exploded view

Cabinet exploded view

REPAIR / SERVICING TV TOSHIBA 55VL963R

Technical description and composition of the TOSHIBA 55VL963R TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 55VL963R
Chassis / Version: PE1080
Panel: LC550EUF (PE) (F1)
T-CON: 6870C-0402C; LG5822
LED driver (backlight): TYL550TE12A01 REV: 0.3 V71A00026300
PWM LED driver: SM1203, LDB7002A
MOSFET LED driver: 390N15A, SDB5150D
Power Supply (PSU): PA-3201-02TS-LF REV: A
PWM Power: A6069H (STB), FAN7930 (PFC)
MainBoard: V28A001417A1 PE1080
IC MainBoard: MSD388USV-VXY, MSB1231-LF, 24C08, MX25L16, TAS5708
Tuner: ENGS7305D5F, SCEB3V
Technical Specifications 55VL963
TOSHIBA 55VL963R
General repair guidelines for TV LCD LED
Possible malfunctions
- The TOSHIBA 55VL963R TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
With such manifestations, the PA-3201-02TS-LF power module usually fails. It is necessary to measure its output supply voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) A6069H (STB), FAN7930 (PFC), if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
As a rule, in such cases there is no display backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the V28A001417A1 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements MSD388USV-VXY, MSB1231-LF, 24C08, MX25L16, TAS5708 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a tuner ENGS7305D5F, SCEB3V is suspected of a malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.

We recommend the owners of the 55VL963R TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!

Service Manuals with Schematic Diagrams 134 pages 2012 on models ----------> 32TL933, 40TL933, 46TL933, 32TL936, 40TL936, 46TL936, 32TL963, 40TL963, 46TL963, 32TL966, 40TL966, 46TL966, 32UL975, 40UL975, 46UL975, 23RL933, 32RL933, 40RL933, 23RL936, 32RL936, 40RL936, 23SL970, 32SL970, 40SL970, 32RL953, 40RL953, 42VL963, 47VL963, 55VL963, 42XL975, 47XL975, 55XL975, 40ML933, 46ML933

The appearance of the MainBoard V28A001417A1 is shown in the figure below:
V28A001417A1
V28A001417A1 can be used in TVs:
TOSHIBA 42VL963R (Panel LC420EUF (PE)(F1)), TOSHIBA 55VL963R (Panel LC550EUF (PE)(F1)).
The appearance of the power supply
Key Features of the TOSHIBA 55VL963R:
Installed matrix (LED-panel) LC550EUF (PE) (F1).
The matrix control uses the Timing Controller (T-CON) 6870C-0402C ;.
The LED driver TYL550TE12A01 is used to power the backlight LEDs, it is controlled by the PWM controller SM1203, LDB7002A. As power elements of the LED driver, keys of type 390N15A, SDB5150D are used.
The necessary supply voltages for all nodes of the TOSHIBA 55VL963R TV are generated by the PA-3201-02TS-LF power module or its analogs using A6069H (STB), FAN7930 (PFC) microcircuits.
MainBoard - the main board (motherboard) is a module V28A001417A1, using microchips MSD388USV-VXY, MSB1231-LF, 24C08, MX25L16, TAS5708 and others.
Tuner ENGS7305D5F, SCEB3V provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC550EUF-PEF1
Type: a-Si TFT-LCD, Panel
Diagonal size: 55 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 1209.6x680.4 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V

Brand: TOSHIBA, Model: 55VL963.
Briefly from the TV: LCD, LED backlight, 55 ", 1920x1080, 1080p Full HD, 3D, DVR, sound: 20W, HDMI: 4, Internet access, Smart TV.
The Toshiba official website has firmware (software update) for the models 55VL963R (6.9.8E.1), 55VL963N (6.9.MD.1), 55VL963G (6.9.MD.1), 55VL963F (6.9.MD.1).
The composition uses MainBoard V28A001417A1 PE1080 and LCD panel (matrix) LC550EUF (PE) (F1).
Power Supply Unit (PSU) PA-3201-02TS-LF REV: A Power Supply.

Technical description
TOSHIBA 55VL963 LED TV with LC550EUF LCD display, diagonal size 55 "(140 cm) in 16: 9 format. The required screen brightness of 360 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 7,000,000: 1 is achieved by special control of the LEDs. V This model uses side lighting from Edge LEDs.
There is support for 3D images using passive polarization technology. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
The 55VL963 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The power of the sound system 20 W (2x10 W) provides two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45). An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV in the operating mode from the network is 185 watts.
Overall dimensions: with stand 1234x795x288 mm, without stand 1234x736x43 mm.
TV Weight: with stand: 26 kg, without stand: 21.2 kg.
Attention! The TOSHIBA 55VL963 LED TV panel LC550EUF (PE) (F1) is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.

REPAIR / SERVICING TV TOSHIBA 55L7453

Technical description and composition of the TOSHIBA 55L7453 TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 55L7453 55L7453RB
Chassis / Version: PE1168
Panel: 96.55S03.001
LED backlight: SVT550AA0_REV04 L / R-TYPE 130710
T-CON: V28A001510A1, 6870C-0482A
LED driver (backlight): integrated into PSU
Power Supply (PSU): B55D-2LE V71A000293A0 AC20282LF-1
MainBoard: PE1168 C V28A001525A1
IC MainBoard: Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR
Tuner: RE232TN
Control: IR: V28A001503A1, WiFi: V86A00021200 WLU5053-D4 (ROHS)
Specifications 55L7453
TOSHIBA 55L7453
General repair guidelines for TV LCD LED
Possible malfunctions
- The TOSHIBA 55L7453 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In some of these cases, the main switching power supply, the B55D-2LE module, turns out to be faulty. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probabilities in the converters, power switches and rectifier diodes.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the PE1168 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner RE232TN and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.

Attention to users! Self-repair of the TOSHIBA 55L7453 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!

The appearance of MainBoard PE1168 is shown in the figure below:
PE1168
The appearance of the power supply
Main features of the TOSHIBA 55L7453 device:
Installed matrix (LED-panel) 96.55S03.001.
The matrix control uses the Timing Controller (T-CON) V28A001510A1.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 55L7453 TV is carried out by the B55D-2LE power module, or its analogs.
MainBoard - the main board (motherboard) is a PE1168 module, using Hynix H5TQ4G63AFR-RDC chips, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR and others.
The RE232TN tuner provides TV reception and channel tuning.
Brand: TOSHIBA, Model: 55L7453.
Shortly from the TV: LCD, LED backlight, 55 ", 1920x1080, 1080p Full HD, 3D, DVR, sound: 30W, HDMI connectors: 4, Internet access, Wi-Fi, Smart TV.
The official Toshiba website has firmware (software update) for the models 55L7453DG (8.1.97.10.01.1), 55L7453DB (81.97.10.01.1).
The composition uses MainBoard PE1168 C V28A001525A1 and LCD-panel 96.55S03.001.
Power Supply Unit (PSU) V71A000293A0 AC20282LF-1 B55D-2LE Power Supply.
Technical description
TOSHIBA 55L7453 LED TV with 96.55S03.001 LCD, 55 "(140 cm) diagonal, 16: 9 format. The required brightness of the screen is 700 cd / m² with LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 1600: 1. Dynamic contrast ratio of 7,000,000: 1 is achieved by special control of the LEDs, and LED display technology is implemented in the display technology of this model.
There is support for 3D images using passive polarization technology. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
The 55L7453 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p, 2160p. Supported media file formats: MP3, WMA, MPEG4, Xvid, MKV, JPEG.
Sound power 30 W (2x15 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 182 watts.
Overall dimensions: with stand 1071x498x215 mm, without stand 1071x453x89 mm.
TV Weight: with stand: 13.5 kg, without stand: 12.3 kg.
Attention! The TOSHIBA 55L7453 LED TV panel 96.55S03.001 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.

REPAIR / SERVICING TV TOSHIBA 50L7363RK

Technical description and composition of the TOSHIBA 50L7363RK TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 50L7363RK
Chassis / Version: L4300
Panel: 50 inch
T-CON: V420HK1-CS5 CM3805A
LED driver (backlight): L500S6-2EA
Power Supply (PSU): N225A001L REV01
MainBoard: 32L4300 Rev 1.02A
IC MainBoard: CPU: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: / W25Q16CVSSIG
Tuner: TDSS-G281D
Control: CT-90430
Specifications 50L7363
TOSHIBA 50L7363RK
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 50L7363RK TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Sometimes the TOSHIBA 50L7363RK TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the common power module N225A001L REV01. If it is working properly, you need to check the processor batteries on the SSB (Main Board). It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If the TOSHIBA 50L7363RK TV does not have an image, but there is sound, a malfunction in the LED backlight circuits is likely. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overstated ESR.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the health of the transitions of the LEDs, as well as the reliability of the contact connections in the lines and connectors.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
Repair of the motherboard 32L4300 Rev 1.02A must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Repair of the board and replacement of the TSU25-E01 microcircuits are carried out with the necessary equipment and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
The malfunction of the TDSS-G281D tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).

Once again, remind users! Attempts to independently repair the TOSHIBA 50L7363RK TV without the appropriate qualifications and experience can lead to its complete non-repairability!

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Toshiba 32L4332/L4333, 39/50/L4333, 32/39/50/L4353, 32/39/50/L4363, 40/50/L6353, 40/50/L6363, 40/50/58/L7333, 40/50/58/L7353, 40/50/58/L7363, Chassis L4300

 Service Manuals with Schematic Diagrams 110 pages 2013 on model ------------------> 32L4332, 32L4333, 39L4333, 50L4333, 32L4353, 39L4353, 50L4353, 32L4363, 39L4363, 50L4363, 40L6353, 50L6353, 40L6363, 50L6363, 40L7333, 50L7333, 58L7333, 40L7353, 50L7353, 58L7353, 40L7363, 50L7363, 58L7363

 The appearance of the MainBoard 32L4300 is shown in the figure below:
32L4300
32L4300 can be used in TVs:
TOSHIBA 32L4353RB (Panel T320HVN04), TOSHIBA 39L4353RB (Panel T390HVN01.0 / XL), TOSHIBA 40L6353RK (Panel LSC400HM06 T01), TOSHIBA 40L7356RK (Panel LSC400HF03 T01), TOSHIBA 40L7363RK (Panel LSC400HF03 T01), TOSHIBA 50L7363RK (Panel 50 inch), TOSHIBA 32L6353RK (Panel 96.32S14.001), TOSHIBA 39L4363D (Panel T390HVN01.0 XL), TOSHIBA 50L4353RK (Panel LC500DUE (SF)(R1)).
Main features of the TOSHIBA 50L7363RK device:
Installed matrix (LED-panel) 50 inch.
The matrix control uses the Timing Controller (T-CON) V420HK1-CS5.
The LED driver L500S6-2EA is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 50L7363RK TV is carried out by the power module N225A001L, or its analogues.
MainBoard - the main board (motherboard) is a 32L4300 module using CPU chips: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: / W25Q16CVSSIG and others.
The TDSS-G281D tuner provides TV reception and channel tuning.


 Technical description
TOSHIBA 50L7363 LED TV with a 50 "(127 cm) diagonal LCD display in 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 3000: 1. Dynamic contrast ratio of 7,000,000: 1 is achieved by special control of the LEDs' operation.This model uses side illumination from Edge LEDs.
There is support for 3D images with active (shutter) technology for separating the right and left channels. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
The 50L7363 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi, Miracast. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 154 watts.
Overall dimensions: with stand 1131x733x232 mm, without stand 1131x675x59 mm.
TV Weight: with stand: 20 kg, without stand: 17.7 kg.
Attention! The TOSHIBA 50L7363 LED TV panel is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.

REPAIR / SERVICING TV TOSHIBA 50L4353RK

Technical description and composition of the TOSHIBA 50L4353RK TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 50L4353RK
Chassis / Version: 32L4300
Panel: LC500DUE (SF) (R1)
LED backlight: 50 R0W2.1 Rev0.4 1 - 6916L-1273A, 6916L-1276A, 6916L-1241A, 6916L-1272A
T-CON: 6870C-0452A, LC500DUE-SFR1
LED driver (backlight): integrated into PSU; 111V 800mA
Power Supply (PSU): B191-002 4H.B1910.001 DARFON D1, B191-002 D25 0433-0082000
MainBoard: 32L4300 REV1.02 60EB40M1MB01P
IC MainBoard: CPU: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG
Tuner: TDSS-G231D
Control: Remote: CT-90429, IR: LV2-IR SFIS, Wi-Fi: 1353A-WLU5053 WLU5053 D4
Specifications 50L4353
TOSHIBA 50L4353RK
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The TOSHIBA 50L4353RK TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In such cases, the B191-002 power supply is usually faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 32L4300 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard - CPU board: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
The TDSS-G231D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.

Attention! For users and owners of 50L4353RK TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-serviceability of the device.

Service Manuals with Schematic Diagrams 110 pages of 2013 on models ------>  32L4332, 32L4333, 39L4333, 50L4333, 32L4353, 39L4353, 50L4353, 32L4363, 39L4363, 50L4363, 40L6353, 50L6353, 40L6363, 50L6363, 40L7333, 50L7333, 58L7333, 40L7353, 50L7353, 58L7353, 40L7363, 50L7363, 58L7363

The appearance of the MainBoard 32L4300 is shown in the figure below:
32L4300
32L4300 can be used in TVs:
TOSHIBA 32L4353RB (Panel T320HVN04), TOSHIBA 39L4353RB (Panel T390HVN01.0 / XL), TOSHIBA 40L6353RK (Panel LSC400HM06 T01), TOSHIBA 40L7356RK (Panel LSC400HF03 T01), TOSHIBA 40L7363RK (Panel LSC400HF03 T01), TOSHIBA 50L7363RK (Panel 50 inch), TOSHIBA 32L6353RK (Panel 96.32S14.001), TOSHIBA 39L4363D (Panel T390HVN01.0 XL), TOSHIBA 50L4353RK (Panel LC500DUE (SF)(R1)).
The appearance of the power supply
Main features of the TOSHIBA 50L4353RK device:
Installed matrix (LED-panel) LC500DUE (SF) (R1).
The matrix control uses the Timing Controller (T-CON) 6870C-0452A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 50L4353RK TV is carried out by the power module B191-002, or its analogs.
MainBoard - the main board (motherboard) is a 32L4300 module using CPU chips: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: W25Q16CVSSIG and others.
The TDSS-G231D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC500DUE-SFR1
Type: a-Si TFT-LCD, Panel
Diagonal size: 50 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 1095.84x616.41 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V

Trademark: TOSHIBA, Model: 50L4353.
Briefly from the TV: LCD, LED backlight, 50 ", 1920x1080, 1080p Full HD, DVR, sound: 14W, HDMI connectors: 4, Internet access, Wi-Fi, Smart TV.
For the 50L4353DB model, the official website has firmware (software update) version 7.1.92.43.01.1.
The composition includes MainBoard 32L4300 REV1.02 60EB40M1MB01P and LCD panel (matrix) LC500DUE (SF) (R1).
Power Supply Unit (PSU) B191-002 4H.B1910.001, 0433-0082000 Power Supply.
Technical description
TOSHIBA 50L4353 LED TV with LC500DUE LCD display, diagonal size 50 "(127 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. LED display technology is implemented in this model's display technology. Design and the technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD).
The 50L4353 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The power of the speaker system of sound 14 W (2x7 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi, Miracast. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 177 watts.
Overall dimensions: with stand 1136x743x230 mm, without stand 1136x669x84 mm.
TV Weight: with stand: 18 kg, without stand: 16.2 kg.
Attention! The TOSHIBA 50L4353 LED TV panel LC500DUE (SF) (R1) is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.

REPAIR / SERVICING TV TOSHIBA 50L2353RK

Technical description and composition of the TOSHIBA 50L2353RK TV, type of panel and applicable modules. The composition of the modules.
TOSHIBA LED
Model: 50L2353RK
Chassis / Version: L2300
Panel: LC500DUE SFR1
LED driver (backlight): DARFON 4H.B1910.001 B191-001
PWM LED driver: OB3372KP (20)
MOSFET LED driver: P0920ATF, P0320AL
Power Supply (PSU): B191-001 DARFON 4H.B1910.001
PWM Power: B127H (8), FAN7930C (PFC), SSC9522S
MOSFET Power: P0850ATF, P1060ATF
Mainboard: L2300
IC MainBoard: MSD8841BX, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L
Tuner: SUT_RE221
Control: CT-90326
Specifications 50L2353
TOSHIBA 50L2353RK
General repair guidelines for TV LCD LED
TOSHIBA 50L2353RK, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
Sometimes the TOSHIBA 50L2353RK TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the common 4H.B1910.001 B191-001 DARFON power supply module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors P0850ATF, P1060ATF for the possibility of an avalanche or thermal breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller B127H (8), FAN7930C (8), SSC9522S, which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the TOSHIBA 50L2353RK lacks an image but has sound, the backlight LEDs of the LC500DUE SFR1 panel or their power converter may malfunction. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.
Motherboard MB007 .... 50L2353AK must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Verification or replacement of elements RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L, MSD8841BX, requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.

Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Toshiba 50L2353D(N) Main L2300

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    TOSHIBA B191-001

Service Manual 56 pages 2014 on model 50L2353D

The appearance of the MainBoard L2300 is shown in the figure below:
L2300
L2300 can be used in TVs:
TOSHIBA 32L2353RB (Panel T320HVN04.0 / LSC320HN03-T01), TOSHIBA 32W2353RB (Panel LSC320AN02-T 01), TOSHIBA 39L2353RB (Panel T390HVN01 / 96.39S02.002), TOSHIBA 50L2353RK (Panel LC500DUE SFR1), TOSHIBA 40L2453RK (Panel UNV4031Y 1823-01XU0TB), TOSHIBA 32L2454RB 32L2453RB (Panel LC320EUJ (FF)(E2)), TOSHIBA 40L2454RK (Panel UNV4031Y 1823-01XU0TB).
PSU Advanced
The power module B191-001 is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced by the device into the mains. The PFC node is a Step-Up Converter based on the FAN7930C PWM controller, which evenly distributes high-frequency pulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the TOSHIBA 50L2353RK device:
Installed matrix (LED panel) LC500DUE SFR1.
The LED driver DARFON is used to power the backlight LEDs, it is controlled by the OB3372KP PWM controller (20). As power elements of the LED driver, keys of the type P0920ATF, P0320AL are used.
The necessary supply voltages for all nodes of the TOSHIBA 50L2353RK TV are generated by the B191-001 power module or its analogs using B127H (8), FAN7930C (PFC), SSC9522S microcircuits and P0850ATF, P1060ATF power switches.
MainBoard - the main board (motherboard) is an L2300 module, using microcircuits MSD8841BX, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L and others.
Tuner SUT_RE221 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC500DUE-SFR1
Type: a-Si TFT-LCD, Panel
Diagonal size: 50 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 1095.84x616.41 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V

Technical description
TOSHIBA 50L2353 LED TV with LC500DUE LCD display, diagonal size 50 "(127 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. This model uses side backlighting from Edge LEDs. Design and the TV’s technical capabilities include watching broadcasts and films in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:. MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the speaker system of sound 14 W (2x7 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), S-Video, component, SCART, HDMI, MHL, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
A digital tuner is capable of receiving television channels in the DVB-T, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 162 watts.
Overall dimensions: with stand 1136x743x230 mm, without stand 1136x669x84 mm.
TV Weight: with stand: 17.5 kg, without stand: 15.7 kg.
Attention! The TOSHIBA 50L2353 LED TV panel LC500DUE SFR1 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.