Technical description and composition of the THOMSON T32C30U TV, panel type and modules used. The composition of the modules.THOMSON
Model: T32C30U
Chassis / Version: MT27C1
Panel: LVW320CSTM C3 V2
T-CON: ST3161A04-1
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9976GN
Power Supply (PSU): 40-A112C6-PWB1XG LA112C6
MainBoard: 40-MT27C1-MAC2XG (H) FLOW
IC MainBoard: WT8227AAKU 1239-BMSL 25Q32BVSIG
Tuner: 18273 TCL
Control: RC3000M13
T32C30U Specifications
THOMSON T32C30U
General recommendations for TV LCD repair
Possible manifestations of defects
- THOMSON T32C30U TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
Most likely, in this case, the main switching power supply (SMPS) 40-A112C6-PWB1XG is faulty. It is necessary to measure its output voltages, and in the event of their absence (full or partial), the serviceability of the power switches of the converters and rectifier diodes should be checked for a possible 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 regulators (PWM) IC_Power, if they have no visible damage to the case and an outright short circuit between the pins, 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.
The defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of the lamps or the inverter.
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 indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 40-MT27C1-MAC2XG 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - WT8227AAKU 1239-BMSL 25Q32BVSIG with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
Before changing the tuner 18273 TCL, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope.
The lack of an image in the presence of a signal from the THOMSON T32C30U is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LVW320CSTM C3 V2, 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, to repair the backlight, disassembly of the LVW320CSTM LCD panel is required - 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-MT27C1-MAC2XG 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 should track the passage of LVDS signals from MainBoard 40-MT27C1-MAC2XG, as well as synchronization signals from T-CON to loops with drivers.
We remind users again! Attempts to self-repair the THOMSON T32C30U TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON T32C30U, Main: 40-MT27C1-MAC2XG (H) FLOW, Panel: LVW320CSTM C3 V2
The appearance of MainBoard 40-MT27C1-MAC2XG is shown in the figure below:40-MT27C1-MAC2XG
External view of the power supply
The main features of the THOMSON T32C30U device:
Installed matrix (LCD panel) LVW320CSTM C3 V2.
Matrix control uses the Timing Controller (T-CON) ST3161A04-1.
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 T32C30U TV is carried out by the 40-A112C6-PWB1XG power module, or its analogs.
MainBoard - the main board (motherboard) is a 40-MT27C1-MAC2XG module, using WT8227AAKU 1239-BMSL 25Q32BVSIG chips and others.
Tuner 18273 TCL provides reception of television programs and tuning to channels.
THOMSON T32C30U LCD TV with LVW320CSTM LCD, 32 "(81 cm) 16: 9. depending on the brightness of the scene. It is possible to view in high quality HD at a resolution of 1366x768 pixels in the standard 720p (HD Ready). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal formation (graphic format) is performed in the standards 480i, 480p , 576i, 576p, 720p, 1080i Multimedia formats supported: MP3, 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, 1360x768.
The power consumed by the TV from the network in the operating mode is not more than 70 W.
Dimensions: with stand 740x495x183 mm, without stand 740x452x105 mm.
TV weight: with stand: 7.5 kg, without stand: 5.9 kg.
Attention! The LVW320CSTM C3 V2 panel of the THOMSON T32C30U 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!