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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 1 May 2020

REPAIR / SERVICING TV MYSTERY MTV-2408WH

Technical description and composition of the MYSTERY MTV-2408WH TV, type of panel and applicable modules. The composition of the modules.
MYSTERY
Model: MTV-2408WH
Chassis / Version: V1J07
Panel: M236H1-L01 REV C2
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): INV220408 REV1.07
Power Supply (PSU): AYP160001
PWM Power: PWM SOT23-6
MOSFET Power: FQPF6N60C
MainBoard: GH-TS26KU-S1 REV1.0
IC MainBoard: CPU: TSUMV36KE-LF, Spi Flash: 25F40, MC4558CDT, 74HC4052D, FT24C32A, CT3257A, FP6180, TDA1517P
Tuner: TDQ-3EQ2
Technical Specifications MTV-2408WH
MYSTERY MTV-2408WH
General recommendations for repairing TV LCD
Possible malfunctions
- The MYSTERY MTV-2408WH does not turn on. There are no signs of operability. The indicators on the front panel do not light up and do not blink, the TV does not respond to the control buttons.
Most often, with such manifestations, the main power module AYP160001 is found to be faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (FQPF6N60C) and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and 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.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the GH-TS26KU-S1 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 CPU chips: TSUMV36KE-LF, Spi Flash: 25F40, MC4558CDT, 74HC4052D, FT24C32A, CT3257A, FP6180, TDA1517P and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The TDQ-3EQ2 tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.

Owners and users of the MYSTERY MTV-2408WH TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH  ----------->   MYSTERY MTV-2408WH V1J07, Main: GH-TS26KU-S1 REV1.0, Panel: M236H1-L01 REV C2

 The appearance of the MainBoard GH-TS26KU-S1 is shown in the figure below:
GH-TS26KU-S1
The appearance of the power supply
Main features of the MYSTERY MTV-2408WH device:
Installed matrix (LCD panel) M236H1-L01 REV C2.
The INV220408 inverter is used to power the backlight.
The necessary supply voltages for all nodes of the MYSTERY MTV-2408WH TV are generated by the AYP160001 power module or its analogs using PWM SOT23-6 microcircuits and power switches of the FQPF6N60C type.
MainBoard - the main board (motherboard) is a GH-TS26KU-S1 module using CPU chips: TSUMV36KE-LF, Spi Flash: 25F40, MC4558CDT, 74HC4052D, FT24C32A, CT3257A, FP6180, TDA1517P and others.
The TDQ-3EQ2 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M236H1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
MYSTERY MTV-2408WH TV with M236H1-L01 LCD, 24 "(61 cm) diagonal size in 16: 9 format. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Contrast as the ratio of maximum brightness to the minimum is 800: 1. The design and technical capabilities of the TV provide for watching broadcasts and films in high quality HD with a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, component, SCART, RGB, VGA, HDMI. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768, 1920x1080.
The power consumed by the TV in the operating mode from the network is 62 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The M236H1-L01 REV C2 panel of the MYSTERY MTV-2408WH LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!



Posted By: FRANK at 07:25
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