Technical description and composition of the THOMSON 26E90NH10 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 26E90NH10
Chassis / Version: TCM1.0E LA
Panel: V260B1-L02
T-CON: V260B1-X02 AAT1168B, AF4410N
Inverter (backlight): integrated into PSU
PWM Inverter: SG3525A
Power Supply (PSU): MIP260T
PWM Power: LD7535 (PWM SOT26-3)
MOSFET Power: 13N50, 3N80
MainBoard: MA1 TCM1.0E LA
IC MainBoard: MT8200ALE 0816-BDSL, S29AL016D, 24C32, MT8293AE
Tuner: TEDE9-2C2B
Control: RC1994301
Specifications 26E90NH10
THOMSON 26E90NH10
General recommendations for TV LCD repair
Possible manifestations of defects
- The THOMSON 26E90NH10 TV does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
With such manifestations, the MIP260T power supply module usually fails. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, the serviceability of the power switches and rectifier diodes should be checked for a possible breakdown (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 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) LD7535 (PWM SOT26-3), in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- 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.
A defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of lamps or the inverter.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 indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the MA1 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 MT8200ALE 0816-BDSL, S29AL016D, 24C32, MT8293AE 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 to TV channels, the TEDE9-2C2B 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 THOMSON 26E90NH10 has no picture when there is a signal, and it is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) V260B1-L02, 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, disassembly of the V260B1-L02 LCD panel is required - a painstaking process that requires increased 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 MA1 often turns out to be faulty, and 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 needs to track the passage of LVDS signals from MainBoard MA1, as well as synchronizing signals from T-CON to loops with drivers.
Owners of the 26E90NH10 TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TCL Power Supply MIP260T
The appearance of the MainBoard MA1 is shown in the figure below:MA1
External view of the power supply
The main features of the THOMSON 26E90NH10 device:
Installed matrix (LCD panel) V260B1-L02.
Matrix control uses Timing Controller (T-CON) V260B1-X02.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by the SG3525A PWM controller.
The formation of the necessary supply voltages for all nodes of the THOMSON 26E90NH10 TV is carried out by the MIP260T power module, or its analogs using LD7535 (PWM SOT26-3) microcircuits and power switches of the 13N50, 3N80 type.
MainBoard - the main board (motherboard) is an MA1 module, using MT8200ALE 0816-BDSL, S29AL016D, 24C32, MT8293AE microcircuits and others.
The TEDE9-2C2B tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V260B1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: RSDS (1 Channel), 45 pins
Voltage: 5.3.3 / 5.0V (VDD / VIN5)
LCD TV THOMSON 26E90NH10 with LCD V260B1-L02, 26 "(66 cm) diagonal 16: 9. Screen brightness of 550 cd / m² is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is not less than 800: 1. You can 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. Digital signal formation (graphic format) is performed in standards 480i, 480p. , 576i, 576p, 720p, 1080i.
Speaker power 30 W (2x15 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), SCART, RGB, VGA, HDMI x2. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
Attention! THOMSON 26E90NH10 LCD TV panel V260B1-L02 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!
