Technical description and composition of the THOMSON T40C11DHU TV, panel type and modules used. The composition of the modules.THOMSON
Model: T40C11DHU
Chassis / Version: MT10L1
Panel: LTA400HM05
Inverter (backlight): integrated into PSU
PWM Inverter: SG3525A, UC3843BN
MOSFET Inverter: 2SK3455
Power Supply (PSU): 40-L182C0-PWE1XG LS182C0 // 08-LS182C0-PW200AA
PWM Power: L6562D, FSQ510
MOSFET Power: 12A50D
MainBoard: 40-MT10L1-MAG2XG
IC MainBoard: MT5310CHOU-BMSL, EN25Q64, 24C32
Tuner: TDT-G731D
Control: RC3000E02; Service Mode: MENU-PICTURE-CONTRAST-9-7-3-5
Specifications T40C11DHU
THOMSON T40C11DHU
General recommendations for TV LCD repair
Possible malfunctions
- The THOMSON T40C11DHU TV does not turn on and does not show any signs of turning on, does not respond to the control buttons and the remote control.
In such cases, you should start looking for a malfunction in the 40-L182C0-PWE1XG power supply circuits. It is then necessary to measure its output voltages and, if they are absent, the power switches (12A50D) and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key often breaks off.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) L6562D, FSQ510, if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no picture, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
These manifestations can be provoked by the power module, or by defects in the inverter, as well as by the skew of currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open circuit.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for the further safe operation of the TV by the owner in normal mode.
- 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 40-MT10L1-MAG2XG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the MT5310CHOU-BMSL, EN25Q64, 24C32 elements. BGA chip faults are usually easy to detect by warm-up.
In cases where there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the TDT-G731D tuner outputs match. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
The lack of an image when there is a signal from THOMSON T40C11DHU is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA400HM05, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the LTA400HM05 LCD panel - a painstaking process that requires special attention and accuracy from the master. In such cases, it is possible, with the slightest carelessness, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But the main board MainBoard 40-MT10L1-MAG2XG often turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within normal limits, then the oscilloscope should track the passage of LVDS signals from MainBoard 40-MT10L1-MAG2XG, as well as synchronizing signals from T-CON to loops with drivers.
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LS182C0 40-L182C0-PWE1XG Power supply
The appearance of the MainBoard 40-MT10L1-MAG2XG is shown in the figure below:40-MT10L1-MAG2XG
External view of the power supply
The main features of the THOMSON T40C11DHU device:
Installed matrix (LCD-panel) LTA400HM05.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by a PWM controller SG3525A, UC3843BN. Keys of type 2SK3455 are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the THOMSON T40C11DHU TV is carried out by the 40-L182C0-PWE1XG power module, or its analogs using L6562D, FSQ510 microcircuits and 12A50D power switches.
MainBoard - the main board (motherboard) is a 40-MT10L1-MAG2XG module, using MT5310CHOU-BMSL, EN25Q64, 24C32 and others.
The TDT-G731D tuner provides reception of television programs and tuning to channels.
THOMSON T40C11DHU LCD TV with LTA400HM05 LCD, 40 "(102 cm) 16: 9 diagonal. 430 cd / m² screen brightness is provided by CCFL (EEFL) backlighting. 4000: 1 dynamic contrast ratio is achieved by special backlight control in depending on the brightness of the scene.The design and technical capabilities of the TV provide viewing in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal formation (graphic format) is produced in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Multimedia formats are supported: MP3, MPEG4, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), audio x2, component, SCART, VGA, HDMI x2, USB. A headphone jack is provided. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner has the ability to receive TV channels in DVB-T, DVB-C standards.
The power consumed by the TV from the network in the operating mode is not more than 170 W.
Overall dimensions: 1115x730x200 mm.
TV weight: 17.3 kg.
Attention! The LTA400HM05 panel of the THOMSON T40C11DHU LCD TV is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!