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 28 April 2020

REPAIR / SERVICING TV MYSTERY MTV-1910LW

Technical description and composition of the MYSTERY MTV-1910LW TV, type of panel and applicable modules. The composition of the modules.
MYSTERY LED
Model: MTV-1910LW
Chassis / Version: V1J07
Panel: V236H1-LE2
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): Adapter
PWM Power: PWM
MainBoard: JUG7.820.807 GDCH LS507 2010.3.29
IC MainBoard: CPU: TSUMV26KU-LF, SPI Flash: EN25F40
Tuner: CDT-3FC212-00
Technical Specifications MTV-1910LW
MYSTERY MTV-1910LW
General repair guidelines for TV LCD LED
If the MYSTERY MTV-1910LW does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the Adapter power module. In some cases, only the processor power regulator may be faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM PWM controller chip or breakage of the resistors in its bundle.
If there is no image when you turn on the MYSTERY MTV-1910LW, or it appears and immediately disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the V236H1-LE2 panel, or in the LED node of the driver-converter of their power supply.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
On the JUG7.820.807 GDCH LS507 2010.3.29 motherboard, in case of a malfunction, you should first check the operation of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU: TSUMV26KU-LF, SPI Flash: EN25F40 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect a malfunction of the CDT-3FC212-00 tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and the data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
It should be remembered! Attempts to repair the MYSTERY MTV-1910LW 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!
Repair MainBoard
The appearance of the MainBoard JUG7.820.807 is shown in the figure below:
JUG7.820.807
JUG7.820.807 can be used on TVs:
MYSTERY MTV-1910LW (Panel V236H1-LE2), MYSTERY MTV-2410LW (Panel V236H1-LE2 Rev.C1), MYSTERY MTV-2210LW (Panel CLAA215FA04).
Main features of the MYSTERY MTV-1910LW device:
Installed matrix (LED-panel) V236H1-LE2.
To power the backlight LEDs, a converter is used, combined with the main board JUG7.820.807.
To power all the internal components of the MYSTERY MTV-1910LW TV, an external adapter type source is used using PWM chips.
MainBoard - the main board (motherboard) is a JUG7.820.807 module, using CPU chips: TSUMV26KU-LF, SPI Flash: EN25F40 and others.
The tuner CDT-3FC212-00 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V236H1-LE2
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 (8-bit), CIE1931 70%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S8P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 05:26
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