Technical description and composition of the TOSHIBA 40L2453RK TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 40L2453RK
Chassis / Version: 32W2453RK
Panel: UNV4031Y 1823-01XU0TB // LSC400HM09-T
LED backlight: IC-C-HWBC40D328
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9908AGN
Power Supply (PSU): UE-3121-1U - 811561 // UE-3840-1U P / N: 811577
PWM Power: LTA1008 (PFC), SS9522S (PWM resonant), A6069H (Standby)
MOSFET Power: TK6A60DR (PFC)
MainBoard: 60EB40M25A01P 32W2453RK // L2300 Rev: 1.03A.01
IC MainBoard: MSD8841BX, H5TQ2G63DFR-PBC, TAS5707L, H27U2G8F2C, W25Q64FVSSIG
Tuner: TDSY-G230D
Control: CT-90326, IR: 32W24 REV1.01
Specifications 40L2453
TOSHIBA 40L2453RK
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the TOSHIBA 40L2453RK does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the power module UE-3121-1U - 811561 of the TV. 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 TK6A60DR (PFC), which are often found in such a state of 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 LTA1008 (PFC), SS9522S (PWM resonant), STR-6069H (Standby), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Sometimes the TOSHIBA 40L2453RK TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - power converter for the backlight LEDs of the UNV4031Y 1823-01XU0TB // LSC400HM09-T panel, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by the power of the backlight unit.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
Repair or diagnostics of the 60EB40M25A01P 32W2453RK motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update the software (software).
In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - MSD8841BX, H5TQ2G63DFR-PBC, TAS5707L, H27U2G8F2C, W25Q64FVSSIG. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
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.
We recommend the owners of the 40L2453RK TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TOSHIBA Chassis 32W2453RK
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TOSHIBA UE-3121-01UN-LF
Service Manual 52 pages of 2014 on models 32W2453RK, 32W2454RK, 32L2453RB, 32L2454RB, 40L2453RK, 40L2454RK
The appearance of the MainBoard 60EB40M25A01P is shown in the figure below:60EB40M25A01P
60EB40M25A01P can be used in TVs:
TOSHIBA 40L2453RK (Panel UNV4031Y 1823-01XU0TB), TOSHIBA 32W2454 32W2454RK (Panel LC320DXJ-SFE1).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the UE-3121-1U module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the LTA1008 PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the TOSHIBA 40L2453RK device:
The matrix (LED-panel) UNV4031Y 1823-01XU0TB or LSC400HM09-T is installed.
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 40L2453RK TV are generated by the power module UE-3121-1U, or its analogues using LTA1008 (PFC), SS9522S (PWM resonant), A6069H (Standby) microcircuits and TK6A60DR (PFC) type power switches.
MainBoard - the main board (motherboard) is a 60EB40M25A01P module, using microchips MSD8841BX, H5TQ2G63DFR-PBC, TAS5707L, H27U2G8F2C, W25Q64FVSSIG and others.
The TDSY-G230D tuner provides TV reception and channel tuning.
TOSHIBA 40L2453 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, 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), AV, audio x2, 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 40L2453 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.