Technical description and composition of the THOMSON 32HS2040C TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32HS2040C
Chassis / Version: MT23L-EU
Panel: LTA320AP13
Inverter (backlight): SSI320_4UK01 REV0.2
PWM Inverter: SSI091ASN
Trans Inverter: LT-U2632 x2
Power Supply (PSU): PW152C0 40-P152C0-PWF1XG
PWM Power: NCP1607, VIPER17L
MOSFET Power: 2SK3455
MainBoard: 40-MT23LE-MAB2XG MT23L-EU
IC MainBoard: MT8223LFMU 1102-BMSL, 24C32W, TDA1517P
Tuner: F23CT-2DD-E 07-380F15-NA12G
Control: RC2000E01
Specifications 32HS2040C
THOMSON 32HS2040C
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- THOMSON 32HS2040C TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or blink, the TV does not respond to the remote control and control buttons.
With such manifestations, a malfunction is most likely found in the PW152C0 power module. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches (2SK3455) and the rectifier diodes of the converters for a possible short circuit.
In the event of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
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) NCP1607, VIPER17L, in the absence of external damage and a short circuit between the terminals, are checked by replacing them with known good ones.
- 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.
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 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-MT23LE-MAB2XG 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 cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - MT8223LFMU 1102-BMSL, 24C32W, TDA1517P which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (detected by warming up).
Before changing the F23CT-2DD-E 07-380F15-NA12G tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals 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 THOMSON 32HS2040C is often not displaying a signal when there is a problem with the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA320AP13, 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 LTA320AP13 LCD panel - a painstaking process that requires special attention and accuracy from the technician. 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-MT23LE-MAB2XG 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-MT23LE-MAB2XG, as well as synchronizing signals from T-CON to loops with drivers.
Remember! Attempts to self-repair the THOMSON 32HS2040C TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PW152C0 Power supply
The appearance of MainBoard 40-MT23LE-MAB2XG is shown in the figure below:40-MT23LE-MAB2XG
40-MT23LE-MAB2XG can be used in TVs:
THOMSON 32HS2040C (Panel LTA320AP13), THOMSON T32C11U (Panel LTA320AP13).
External view of the power supply
The main features of the THOMSON 32HS2040C device:
Installed matrix (LCD panel) LTA320AP13.
To power the backlight lamps, the SSI320_4UK01 inverter is used, controlled by the SSI091ASN PWM controller. The transformer LT-U2632 x2 is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the THOMSON 32HS2040C TV is carried out by the PW152C0 power module, or its analogs using NCP1607, VIPER17L microcircuits and 2SK3455 power switches.
MainBoard - the main board (motherboard) is a 40-MT23LE-MAB2XG module, using MT8223LFMU 1102-BMSL, 24C32W, TDA1517P and others.
Tuner F23CT-2DD-E 07-380F15-NA12G provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP13
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 697.68x392.256 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
THOMSON 32HS2040C LCD TV with LTA320AP13 LCD, 32 "(81 cm) 16: 9 diagonal. 400 cd / m² screen brightness is provided by CCFL (EEFL) backlighting. 25000: 1 dynamic contrast is achieved by special backlight control in depending on the brightness of the scene. It is possible to view in high quality HD at a resolution of 1366x768 pixels in the 720p standard (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, 1080p.
Speaker power of 10 W (2x5 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), SCART, RGB, VGA, HDMI. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV from the network in the operating mode is no more than 54 W.
Dimensions: with stand 782x571x244 mm, without stand 782x524x80 mm.
TV weight: with stand: 11 kg, without stand: 10 kg.
Attention! The LTA320AP13 panel of the THOMSON 32HS2040C 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!
