Technical description and composition of the THOMSON 26HR3022 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 26HR3022
Chassis / Version: MT35
Panel: T260XW02 V.P
Lamp backlight: 8 Lamp CCFL
Inverter (backlight): V225-402HF 4H + V2258.061 / C1
Power Supply (PSU): 40-PWL32B-PWD1XG
PWM Power: VIPer22, L6563, L6599
MOSFET Power: 2SK3568
MainBoard: 40-LD5335-MAD2XG
IC MainBoard: MT5133AN, TDA9886TS, WT6702F, TDA7266
Tuner: TDQG8-601A
Specifications 26HR3022
THOMSON 26HR3022
General recommendations for TV LCD repair
Possible malfunctions
- THOMSON 26HR3022 does not turn on, 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 40-PWL32B-PWD1XG power supply usually fails. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (2SK3568) and the rectifier diodes of the converters for a possible 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.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers VIPer22, L6563, L6599, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- 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.
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 TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the 40-LD5335-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). Complex repair of MB (SSB) is possible only in a service center with the necessary equipment. Checking or replacing MT5133AN, TDA9886TS, WT6702F, 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 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 TDQG8-601A 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 the THOMSON 26HR3022 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) T260XW02 V.P, 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 T260XW02 LCD panel - 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-LD5335-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 the above measurements are within the normal range, then the oscilloscope should track the passage of LVDS signals from MainBoard 40-LD5335-MAD2XG, as well as synchronizing signals from T-CON to loops with drivers.
Remember! Attempts to self-repair the THOMSON 26HR3022 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!
The appearance of the MainBoard 40-LD5335-MAD2XG is shown in the figure below:40-LD5335-MAD2XG
External view of the power supply
The main features of the THOMSON 26HR3022 device:
Installed matrix (LCD panel) T260XW02 V.P.
The V225-402HF inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the THOMSON 26HR3022 TV is carried out by the 40-PWL32B-PWD1XG power module, or its analogs using VIPer22, L6563, L6599 microcircuits and 2SK3568 power switches.
MainBoard - the main board (motherboard) is a 40-LD5335-MAD2XG module using MT5133AN, TDA9886TS, WT6702F, TDA7266 and others.
Tuner TDQG8-601A provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VP
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
THOMSON 26HR3022 LCD TV with T260XW02 LCD, 26 "(66 cm) diagonal, 16: 9 format. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) backlighting. Dynamic contrast ratio of 10,000: 1 is achieved by special control of backlight operation 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 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, 1080p.
The power of the sound system is 6 W (2x3 W), provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, S-Video, component, SCART, RGB, VGA, HDMI x2, USB. 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. The digital tuner has the ability to receive television channels in DVB-T standards.
The power consumed by the TV from the network in the operating mode is not more than 70 W.
Dimensions: with stand 663x495x202 mm, without stand 663x461x92 mm.
TV weight: with stand: 7.8 kg, without stand: 7.5 kg.
Attention! The panel T260XW02 V.P of the THOMSON 26HR3022 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!
