Technical description and composition of the TOSHIBA 40L2454RK TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 40L2454RK
Chassis / Version: L2300
Panel: UNV4031Y 1823-01XU0TB
LED backlight: IC-C-HWBC40D328
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9908AGN
Power Supply (PSU): UE-3121-01
PWM Power: A6069H, NCP1608B, SSC9522S
MOSFET Power: K6A60DR
MainBoard: L2300 REV: 1.03A.01 TOS-TUN80-EB40S00A0
IC MainBoard: MSD8841BX-VW, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L
Tuner: TDSY-G230D
Control: Remote: IR: 32W24 REV: 1.01
Specifications 40L2454
TOSHIBA 40L2454RK
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The TOSHIBA 40L2454RK TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In such cases, the malfunction should be sought first in the UE-3121-01 power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (K6A60DR) and rectifier diodes for a possible partial or complete breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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) A6069H, NCP1608B, SSC9522S, 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 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 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 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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips MSD8841BX-VW, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the TDSY-G230D tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention to users! Self-repair of the TOSHIBA 40L2454RK TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
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 40L2454RK device:
Installed matrix (LED panel) UNV4031Y 1823-01XU0TB.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9908AGN PWM controller.
The necessary supply voltages for all nodes of the TOSHIBA 40L2454RK TV are generated by the power module UE-3121-01 or its analogs using A6069H, NCP1608B, SSC9522S microcircuits and K6A60DR type power switches.
MainBoard - the main board (motherboard) is an L2300 module, using microchips MSD8841BX-VW, RT9025 (8), 5432 P22564 (8), 4435GM (8), TAS5707L and others.
The TDSY-G230D tuner provides TV reception and channel tuning.
TOSHIBA 40L2454 LED TV with UNV4031Y LCD, 40 "(102 cm) diagonal size 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 5000: 1 Dynamic contrast ratio of 25000: 1 is achieved by special control of the LEDs. 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 at a resolution of 1920x1080 pixels in gr decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 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. 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 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.
The power consumed by the TV in the operating mode from the network is 98 watts.
Overall dimensions: with stand 925x583x202 mm, without stand 925x547x72 mm.
TV mass: with stand: 9 kg, without stand: 8.5 kg.
Attention! The UNV4031Y 1823-01XU0TB panel of the TOSHIBA 40L2454 LED TV 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.