Technical description and composition of the THOMSON 27MT02E64 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 27MT02E64
Chassis / Version: MT02
Panel: V270B1-L03 REV.C1
Inverter (backlight): 1270B1-12A; 6 LAMP
PWM Inverter: OZ964GN
Power Supply (PSU): 40-MON37A-PWD1XG
PWM Power: VIPer22A, NCP1653, NCP1377B, LM393
MOSFET Power: 2SK3568, STW20NM50
MainBoard: 40-MT02MF-MAA4XG
IC MainBoard: MT8202AG, HY5DU28822FTP, 24C32, 24C08, 24C02
Tuner: 40-32V6GM-TUF2XG / F07WP-3BE-E
Specifications 27MT02E64
THOMSON 27MT02E64
General recommendations for TV LCD repair
Possible malfunctions
- TV THOMSON 27MT02E64 does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
In such cases, you should start looking for a fault in the 40-MON37A-PWD1XG power supply circuits. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (2SK3568, STW20NM50) and rectifier diodes for possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks off.
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) VIPer22A, NCP1653, NCP1377B, LM393, if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and immediately disappears
These manifestations can be triggered by the power module, or by defects in the inverter, as well as by skewed currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the keys of the converter and the secondary windings of the transformers.
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 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 40-MT02MF-MAA4XG 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). Repair of the board and replacement of microcircuits MT8202AG, HY5DU28822FTP, 24C32, 24C08, 24C02 are performed if the necessary equipment and the corresponding element base are available. Failures associated with the use of BGA soldering technologies can be localized by warming up.
If the TV operates normally from external devices, but does not tune in to TV channels, the 40-32V6GM-TUF2XG / F07WP-3BE-E tuner 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 27MT02E64 is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) V270B1-L03 REV.C1, 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, to repair the backlight, disassembling the V270B1-L03 LCD panel is required - a painstaking process that requires special attention and accuracy from the master. 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 the main board MainBoard 40-MT02MF-MAA4XG 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-MT02MF-MAA4XG, as well as synchronization signals from T-CON to loops with drivers.
Users and owners of TVs should remember that attempts to self-repair a THOMSON 27MT02E64 TV without appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 40-MON37A-PWD1XG Power supply
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> THOMSON 27MT02E64 MT02, Main: 40-MT02MF-MAA4XG, Panel: V270B1-L03 REV.C1
The appearance of the MainBoard 40-MT02MF-MAA4XG is shown in the figure below:40-MT02MF-MAA4XG
40-MT02MF-MAA4XG can be used in TVs:
THOMSON 27MT02E64 (Panel V270B1-L03 REV.C1 ), THOMSON 32MT02E64 (Panel V320B1-L04 Rev.C1).
The main features of the THOMSON 27MT02E64 device:
Installed matrix (LCD panel) V270B1-L03 REV.C1.
The inverter 1270B1-12A is used to power the backlight lamps; controlled by the OZ964GN PWM controller.
The formation of the necessary supply voltages for all nodes of the THOMSON 27MT02E64 TV is carried out by the 40-MON37A-PWD1XG power module, or its analogs using VIPer22A, NCP1653, NCP1377B, LM393 microcircuits and 2SK3568, STW20NM50 power switches.
MainBoard - the main board (motherboard) is a 40-MT02MF-MAA4XG module, using the MT8202AG, HY5DU28822FTP, 24C32, 24C08, 24C02 and others.
The 40-32V6GM-TUF2XG / F07WP-3BE-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V270B1-L03
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 596.259x335.232 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV THOMSON 27MT02E64 with LCD V270B1-L03, 27 "diagonal 16: 9. Screen brightness 550 cd / m² provided by CCFL (EEFL) backlight. Dynamic contrast ratio 5000: 1 is achieved by special control of the backlight depending on scene brightness.You can view in high quality HD at a resolution of 1366x768 pixels in the standard 720p (HD Ready) .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.
Speaker power 15 W (2x7.5 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, component, SCART x2, RGB, VGA. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
Attention! THOMSON 27MT02E64 LCD TV panel V270B1-L03 REV.C1 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!
