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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Monday, 13 April 2020

REPAIR / SERVICING TV ERISSON 26LH02

Technical description and composition of the ERISSON 26LH02 TV, type of panel and applicable modules. The composition of the modules.
ERISSON
Model: 26LH02
Chassis / Version: NUSTC_MTK8201G_V03_MP
Panel: V260B1 L03
T-CON: V260B1-C03; TPS65161, P2003 (8), 324A (14), CM1671A-KQ, ME6100D
Inverter (backlight): VIT70038.50 REV: 3
PWM Inverter: OZ964SN, AS324M-E1, KIA78M05F
Power Supply (PSU): MLT666 T REV: 2.8
PWM Power: MC0628R, L6562D, OB2262 (PWM SOT23-6)
MOSFET Power: 18N50, 6N60C
MainBoard: NUSTC_MTK8201G_V03_MP
IC MainBoard: MTK8201G, S29AL008D, A2V64S4OCTP, 24C02BN, TPA3008D2, MT8293AE, WM8776S
Tuner: ET-8F2D-QF106L
Specifications 26LH02
ERISSON 26LH02
General recommendations for repairing TV LCD
Possible malfunctions
- The ERISSON 26LH02 TV does not turn on and does not show any signs of turning on. There are no reactions to the control buttons or the remote control.
In such cases, the MLT666 power supply is usually faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip MC0628R, L6562D, OB2262 (PWM SOT23-6) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable 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 finished, it is necessary 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 the operating mode, it does not respond to the remote control.
Repair or diagnostics of the NUSTC_MTK8201G_V03_MP motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips MTK8201G, S29AL008D, A2V64S4OCTP, 24C02BN, TPA3008D2, MT8293AE, WM8776S and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner ET-8F2D-QF106L and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention TV owners! Self-repair attempts by ERISSON 26LH02 are not recommended by the manufacturer and can lead to serious negative consequences!




Repair MainBoard
The appearance of MainBoard NUSTC_MTK8201G_V03_MP is shown in the figure below:
NUSTC_MTK8201G_V03_MP
NUSTC_MTK8201G_V03_MP can be used on TVs:
ERISSON 32LH02 (Panel V260B1-L03), ERISSON 30LH02 (Panel V296W1-L01), ERISSON 26LH02 (Panel V260B1 L03).
The appearance of the power supply
Main features of the ERISSON 26LH02 device:
Installed matrix (LCD panel) V260B1 L03.
The matrix control uses the Timing Controller (T-CON) V260B1-C03 ;.
To power the backlight, an inverter VIT70038.50 is used, it is controlled by the PWM controller OZ964SN, AS324M-E1, KIA78M05F.
The necessary supply voltages for all nodes of the TV ERISSON 26LH02 are generated by the MLT666 power module or its analogs using microchips MC0628R, L6562D, OB2262 (PWM SOT23-6) and power switches of the type 18N50, 6N60C.
MainBoard - the main board (motherboard) is a NUSTC_MTK8201G_V03_MP module, using microchips MTK8201G, S29AL008D, A2V64S4OCTP, 24C02BN, TPA3008D2, MT8293AE, WM8776S and others.
The ET-8F2D-QF106L tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V260B1-P02
Type: a-Si TFT-LCD, CELL
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare, Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 800: 1
Display Colors: 16.2M (8-bit)
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Signal Interface: RSDS (1 Channel), 45 pins
Voltage: 3.3 / 5.0V (VDD / VIN5)
Posted By: FRANK at 06:54
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