REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Tuesday, 8 September 2020

REPAIRING / SERVICING TV THOMSON 26N90NH10

Technical description and composition of the THOMSON 26N90NH10 TV, panel type and modules used. The composition of the modules.
THOMSON
Model: 26N90NH10
Chassis / Version: 40-MT01EU-MAI2XG
Panel: V260B1-LN1 Rev. C1
Lamp backlight: 4 LAMP CCFL
T-CON: 40-V260B1-TCD2XG
Inverter (backlight): integrated into PSU
Power Supply (PSU): MIP260T rev: A2
PWM Power: L6562, LD7535
MOSFET Power: 13N50, 3N80
MainBoard: 40-MT01EU-MAI2XG T8-EE92NMS-MA2 4A-LCD26T-CM4
IC MainBoard: CPU: MT8200ALE, EEPROM: AT24C32, FLASH: S29AL016D70TFI02, HDMI INPUT: MT8293AE
Tuner: TEDE9-2C2B
Appearance
THOMSON 26N90NH10
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- THOMSON 26N90NH10 TV 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 some of these cases, the fault is detected in the MIP260T power supply module. Its output voltages should be measured and, in their absence, the serviceability of the power switches (13N50, 3N80) and the rectifier diodes in the converters should be checked for possible breakdown.
In the event of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
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) L6562, LD7535, 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.
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 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-MT01EU-MAI2XG 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 - CPU: MT8200ALE, EEPROM: AT24C32, FLASH: S29AL016D70TFI02, HDMI INPUT: MT8293AE 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 (indicated by warming up).
Before changing the TEDE9-2C2B tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Remember! Attempts to self-repair the THOMSON 26N90NH10 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!
Additional MainBoard Repair
The appearance of the MainBoard 40-MT01EU-MAI2XG is shown in the figure below:
40-MT01EU-MAI2XG
40-MT01EU-MAI2XG can be used in TVs:
PHILIPS 26PFL3403S / 60 (Panel T260XW03 V.3), TCL 26E92NH10 (Panel V260B1-LN1 Rev. C1), THOMSON 26N90NH10 (Panel V260B1-LN1 Rev. C1).


External view of the power supply
The main features of the THOMSON 26N90NH10 device:
Installed matrix (LCD-panel) V260B1-LN1 Rev. C1.
Matrix control uses the 40-V260B1-TCD2XG Timing Controller (T-CON).
A converter combined with a power supply is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the THOMSON 26N90NH10 TV is carried out by the MIP260T power module, or its analogs using L6562, LD7535 microcircuits and power switches of the 13N50, 3N80 type.
MainBoard - the main board (motherboard) is a 40-MT01EU-MAI2XG module, using CPU chips: MT8200ALE, EEPROM: AT24C32, FLASH: S29AL016D70TFI02, HDMI INPUT: MT8293AE 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-LN1
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
Surface: Antiglare (Haze 25%), Hard coating (3H)
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: 5.0 / 3.3V (VIN5 / VDD)
Posted By: FRANK at 06:43
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