Technical description and composition of the THOMSON 32N90NH22N TV, panel type and modules used. The composition of the modules.THOMSON
Model: 32N90NH22N
Chassis / Version: МТ35
Panel: LTA320AP02
Power Supply (PSU): 08-PW37C03
PWM Power: L6563 (PFC 14pin), L6599D, Viper22
MainBoard: MT35
IC MainBoard: MT5335PU, MT8295AE, 25P32, 24C16, TDA7266
Tuner: 07-361AI5-TB1G TDQG4-601A
Specifications 32N90NH22N
THOMSON 32N90NH22N
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- THOMSON 32N90NH22N does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In such cases, the fault should be looked for primarily in the 08-PW37C03 power module. Its output voltages should be measured and, in their absence, the serviceability of the power switches and rectifier diodes in the converters should be checked for possible breakdown.
In case of any breakdowns 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.
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) L6563 (PFC 14pin), L6599D, Viper22, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, 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, you should ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open.
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 further safe operation of the TV by the owner in normal mode.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the MT35 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Complex repair of MB (SSB) is possible only in a service center with the necessary equipment. Checking or replacing MT5335PU, MT8295AE, 25P32, 24C16, TDA7266 elements requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
If the TV operates normally from external devices, but does not tune to TV channels, the tuner 07-361AI5-TB1G TDQG4-601A may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
The lack of an image in the presence of a signal from THOMSON 32N90NH22N 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, 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 often the main board MainBoard MT35 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 must track the passage of LVDS signals from the MainBoard MT35, as well as synchronizing signals from the T-CON to the loops with drivers.
Attention to users! Self-repair of the THOMSON 32N90NH22N TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The main features of the THOMSON 32N90NH22N device:Installed matrix (LCD-panel) LTA320AP02.
The formation of the necessary supply voltages for all nodes of the THOMSON 32N90NH22N TV is carried out by the 08-PW37C03 power module, or its analogs using L6563 (PFC 14pin), L6599D, Viper22 microcircuits.
MainBoard - the main board (motherboard) is an MT35 module, using chips MT5335PU, MT8295AE, 25P32, 24C16, TDA7266 and others.
Tuner 07-361AI5-TB1G TDQG4-601A provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP02
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
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 32N90NH22N 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 brightness is at least 1200 : 1. Can be viewed in high quality HD at a resolution of 1366x768 pixels in the 720p standard (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Digital signal formation (graphic format) is performed in 480i, 480p, 576i standards , 576p, 720p, 1080i.
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, 1360x768. 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 32N90NH22N 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!
