Technical description and composition of the TOSHIBA 32L2454RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32L2454RB 32L2453RB
Chassis / Version: L2300
Panel: LC320EUJ (FF) (E2) // UNV3232-04Y
LED backlight: 32 7PKG Rev0.1 2013.10.10
T-CON: LC470EUN-SFF1 VER 1.0 6870C-0438A
LED driver (backlight): integrated into PSU; 82.53V 350mA
PWM LED driver: OZ9908AGN
MOSFET LED driver: AOD478
Power Supply (PSU): UE-3840-1U (811577)
PWM Power: FAN6754, IN1M101
MOSFET Power: AOTF9N70
MainBoard: L2300 REV.1.03A. 01. 60EB40M1XA01P 32AV933_MAIN BD
IC MainBoard: MSD8841BX, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L
Tuner: TDSY-G230D
Control: IR: 32W24 REV1.01
Specifications 32L2454
TOSHIBA 32L2454RB
General repair guidelines for TV LCD LED
Possible manifestations of defects
- TOSHIBA 32L2454RB does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In some of these cases, the main switching power supply, the UE-3840-1U module, is 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 (AOTF9N70) and rectifier diodes.
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.
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) FAN6754, OZ9908AGN, 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.
Often in such cases, there is no LED 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.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the L2300 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MSD8841BX, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L. BGA chip malfunctions are usually easy to detect by warming up.
If you suspect a malfunction of the TDSY-G230D tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention! For users and owners of 32L2454RB 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-repairability of the device.
Service Manual 52 pages of 2014 on models 32W2453RK, 32W2454RK, 32L2453RB, 32L2454RB, 40L2453RK, 40L2454RK.
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).
The appearance of the power supply
Main features of the TOSHIBA 32L2454RB device:
Installed matrix (LED-panel) LC320EUJ (FF) (E2) or UNV3232-04Y.
The matrix control uses the Timing Controller (T-CON) LC470EUN-SFF1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9908AGN PWM controller. As the power elements of the LED driver, keys of the AOD478 type are used.
The necessary supply voltages for all nodes of the TOSHIBA 32L2454RB TV are generated by the power module UE-3840-1U, or its analogs using FAN6754, IN1M101 microchips and AOTF9N70 type power switches.
MainBoard - the main board (motherboard) is an L2300 module, using microcircuits MSD8841BX, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L and others.
The TDSY-G230D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUJ-FFE2
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.75% (with Polarizer)
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit)
Response Time: 6 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 32L2454.
Shortly from the TV: LCD, LED backlight, 32 ", 1920x1080, 1080p Full HD, sound: 14W, HDMI connectors: 2.
On the official website of Toshiba there are firmware (software updates) for the models 32L2454RB (05/05/15), 32L2454DG (05/01/15).
The composition uses MainBoard L2300 REV.1.03A. 01. 60EB40M1XA01P and LCD panel (matrix) LC320EUJ (FF) (E2).
Power Supply Unit (PSU) UE-3840-1U Power Supply.
TOSHIBA 32L2454 LED TV with LC320EUJ LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 1400: 1 The LCD panel uses backlighting from Direct LEDs.The design and technical capabilities of the TV include watching programs and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal can . T be processed by analog systems, PAL, SECAM, NTSC Image processing and generation of the digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:. MP3, 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, VGA, HDMI x2, 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, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 735x478x183 mm, without stand 735x442x70 mm.
TV mass: 6 kg.
Attention! The TOSHIBA 32L2454 LED TV panel LC320EUJ (FF) (E2) 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.