Technical description and composition of the THOMSON 32E90NH22C TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32E90NH22C
Chassis / Version: MT35
Panel: LTA320AP02
Inverter (backlight): SSI320-4UA01
PWM Inverter: OZ9966SN
MOSFET Inverter: STU432S, KMB054N40DB
Power Supply (PSU): 40-5PL37C-PWB1XG
PWM Power: L6563, L6599, Viper22
MainBoard: 40-EUMT35-MAF2XG
IC MainBoard: MT5335PU, MT8295AE, 25P32, 24C16, WT6702F
Tuner: 07-361AI5-TB1G, TDQG4-601A
Specifications 32E90NH22C
THOMSON 32E90NH22C
General recommendations for TV LCD repair
Possible manifestations of defects
- The THOMSON 32E90NH22C TV does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
With similar manifestations, a malfunction is most likely found in the 40-5PL37C-PWB1XG power module. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short-circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
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) L6563, L6599, Viper22, if they have no 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.
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-EUMT35-MAF2XG 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 - MT5335PU, MT8295AE, 25P32, 24C16, WT6702F 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 tuner 07-361AI5-TB1G, TDQG4-601A, if it is not possible to tune to television channels, 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 THOMSON 32E90NH22C is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA320AP02, for example, a malfunction of the CCFL (EEFL) lamps, and outside in their power source - the 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 LTA320AP02 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-EUMT35-MAF2XG 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 the normal range, then the oscilloscope should track the passage of LVDS signals from MainBoard 40-EUMT35-MAF2XG, 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 FIRMWARE FOR SPI FLASH EEPROM -----------> THOMSON 32E90NH22C MT35, Main: 40-EUMT35-MAF2XG, Panel: LTA320AP02
The appearance of the MainBoard 40-EUMT35-MAF2XG is shown in the figure below:40-EUMT35-MAF2XG
External view of the power supply
The main features of the THOMSON 32E90NH22C device:
Installed matrix (LCD panel) LTA320AP02.
To power the backlight lamps, the SSI320-4UA01 inverter is used, controlled by the OZ9966SN PWM controller. The switches of the STU432S, KMB054N40DB type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the THOMSON 32E90NH22C TV is carried out by the 40-5PL37C-PWB1XG power module, or its analogs using L6563, L6599, Viper22 microcircuits.
MainBoard - the main board (motherboard) is a 40-EUMT35-MAF2XG module, using MT5335PU, MT8295AE, 25P32, 24C16, WT6702F and others.
Tuner 07-361AI5-TB1G, TDQG4-601A provides reception of television programs and tuning to channels.
THOMSON 32E90NH22C LCD TV with LCD LTA320AP02, 32 "(81 cm) 16: 9 diagonal. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 1200 : 1. Dynamic contrast ratio of 10000: 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 20 W (2x10 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, SCART, RGB, VGA, HDMI x2, USB. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768. The digital tuner has the ability to receive television channels in DVB-T standards.
Overall dimensions: 796x582x230 mm.
TV weight: 16 kg.
Attention! The LTA320AP02 panel of the THOMSON 32E90NH22C 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!
