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.