Technical description and composition of the THOMSON T42C30HU TV, panel type and modules used. The composition of the modules.THOMSON
Model: T42C30HU
Chassis / Version: 40-MS82T0-MAA2XG
Panel: LVF420AUTM C2V4 // T420E33AU.2EM
T-CON: 40-42E330-ZJA2XG; TPS65161, BUF16821
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9976GN
Power Supply (PSU): 40-A152C4-PWE1XG 08-IA152C4-PW200AA // IPL40A-01
PWM Power: FAN7930C, FAN6754MR
MainBoard: 40-MS82T0-MAA2XG
IC MainBoard: MST6E182VG-LF-Z1, 25Q32, TDA1517P
Tuner: 18273 TCL
Specifications T42C30HU
THOMSON T42C30HU
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- THOMSON T42C30HU does not turn on, indicators on the front panel do not light or flash. The TV does not respond to control buttons and the remote control.
In such cases, the 40-A152C4-PWE1XG power supply usually fails. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches and rectifier diodes for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and less often the current sensor in the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying a PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) FAN7930C, FAN6754MR, in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
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.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- 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-MS82T0-MAA2XG 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). If it is not possible to replace the MB (SSB) board, you must check the serviceability of its elements - MST6E182VG-LF-Z1, 25Q32, TDA1517P. Defective components must be replaced.
The malfunction of the 18273 TCL tuner is established after checking the software and all supply voltages at its outputs. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
The lack of an image in the presence of a signal from the THOMSON T42C30HU is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LVF420AUTM C2V4, 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 LVF420AUTM LCD panel - a painstaking process that requires special attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, 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-MS82T0-MAA2XG 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 the above measurements are within the normal range, then the oscilloscope must track the passage of LVDS signals from MainBoard 40-MS82T0-MAA2XG, as well as synchronizing signals from T-CON to loops with drivers.
We remind users again! Attempts to repair the THOMSON T42C30HU TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T42C30HU, Main: 40-MS82T0-MAA2XG, Panel: LVF420AUTM C2V4
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T42C30HU, Main: 40-MS82T0-MAA2XG, Panel: T420E33AU.2EM
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 01-A152C4-PWD (40-A152C4-PWE1XG) Power supply
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 40-IPL40A-PWD1XG (IPL40A-01) Power supply
The appearance of the MainBoard 40-MS82T0-MAA2XG is shown in the figure below:40-MS82T0-MAA2XG
External view of the power supply
The main features of the THOMSON T42C30HU device:
Installed matrix (LCD panel) LVF420AUTM C2V4 or T420E33AU.2EM.
Matrix control uses Timing Controller (T-CON) 40-42E330-ZJA2XG ;.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by the OZ9976GN PWM controller.
The formation of the necessary supply voltages for all nodes of the THOMSON T42C30HU TV is carried out by the 40-A152C4-PWE1XG power module, or its analogs using FAN7930C, FAN6754MR microcircuits.
MainBoard - the main board (motherboard) is a 40-MS82T0-MAA2XG module using MST6E182VG-LF-Z1, 25Q32, TDA1517P and others.
Tuner 18273 TCL provides reception of television programs and tuning to channels.
THOMSON T42C30HU LCD TV with LVF420AUTM LCD, 42 "(107 cm) diagonal, 16: 9 format. 350 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, WMA, MPEG4, JPEG.
Speaker power 8 W (2x4 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), AV x2, audio x4, component, VGA, HDMI, USB. 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 power consumed by the TV from the network in operating mode is not more than 120 watts.
Dimensions: with stand 973x622x240 mm, without stand 973x581x87 mm.
TV weight: with stand: 11 kg, without stand: 8 kg.
Attention! The LVF420AUTM C2V4 panel of the THOMSON T42C30HU 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!