Technical description and composition of the THOMSON 32M61NH20 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32M61NH20
Chassis / Version: MT01
Panel: LK315T3LZ54
Lamp backlight: 14 Lamp CCFL
Inverter (backlight): RDENC2287TPZ A IM38 32A
PWM Inverter: BD9777
MOSFET Inverter: RSS085, TPC8110
Power Supply (PSU): JSK3200-007
PWM Power: ICE3B0565
MOSFET Power: 2SK3568
MainBoard: 40-MT01TI-MAD2XG
IC MainBoard: MT8202, MT8293AE, S29AL016D70TFI02, ULB800057A
Tuner: TEDE9-2C2B
Specifications 32M61NH20
THOMSON 32M61NH20
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- The THOMSON 32M61NH20 TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
Most often, with similar manifestations, the main power module JSK3200-007 turns out to be faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (2SK3568) and rectifier diodes in the converters for a short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key most often breaks off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) ICE3B0565 are usually checked by replacing them with new ones, or knowingly working.
- 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 go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the 40-MT01TI-MAD2XG 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, it is necessary to check the serviceability of its elements - MT8202, MT8293AE, S29AL016D70TFI02, ULB800057A. Defective components must be replaced.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the TEDE9-2C2B tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
The lack of an image in the presence of a signal from THOMSON 32M61NH20 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LK315T3LZ54, 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 LCD panel LK315T3LZ54 - 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-MT01TI-MAD2XG 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-MT01TI-MAD2XG, as well as synchronization signals from T-CON to loops with drivers.
Remember! Attempts to self-repair the THOMSON 32M61NH20 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!
Additional MainBoard RepairThe appearance of MainBoard 40-MT01TI-MAD2XG is shown in the figure below:
40-MT01TI-MAD2XG
External view of the power supply
The main features of the THOMSON 32M61NH20 device:
Installed matrix (LCD panel) LK315T3LZ54.
To power the backlight lamps, the RDENC2287TPZ inverter is used, controlled by the BD9777 PWM controller. The switches of the RSS085, TPC8110 type are used as the power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the THOMSON 32M61NH20 TV is carried out by the JSK3200-007 power module, or its analogs using ICE3B0565 microcircuits and 2SK3568 type power switches.
MainBoard - the main board (motherboard) is a 40-MT01TI-MAD2XG module, using MT8202, MT8293AE, S29AL016D70TFI02, ULB800057A and others.
The TEDE9-2C2B tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SHARP
Model: LK315T3LZ54
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: ASV, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (2H)
Brightness: 450 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit)
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 37 pins
Voltage: 5.0V
LCD TV THOMSON 32M61NH20 with LCD display LK315T3LZ54, diagonal size 32 "(81 cm) 16: 9 format. 450 cd / m² screen brightness is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is not less than 1500 : 1. Dynamic contrast ratio of 5000: 1 is achieved by special control of the backlight operation depending on the brightness of the scene.It is possible to view in high quality HD at a resolution of 1366x768 pixels in 720p standard (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC The digital signal generation (graphic format) is performed in the 480i, 480p, 576i, 576p, 720p, 1080i standards.
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), AV, audio x3, S-Video, component, VGA, HDMI x2. 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, 1360x768.
Dimensions: with stand 813x629x220 mm, without stand 813x562x116 mm.
TV weight: 14.5 kg.
Attention! The LK315T3LZ54 panel of the THOMSON 32M61NH20 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!
