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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Thursday 30 April 2020

REPAIR / SERVICING TV MYSTERY MTV-3215LW

Technical description and composition of the MYSTERY MTV-3215LW TV, type of panel and applicable modules. The composition of the modules.
MYSTERY LED
Model: MTV-3215LW
Chassis / Version: V1L02
Panel: LTA320AN01 D03
LED driver (backlight): SSL320_0E2D Rev0.0
PWM LED driver: SSL1003N
Trans LED driver: KL-050-11601A-KD
Power Supply (PSU): KPS-L070C2-01
PWM Power: FAN6755
MOSFET Power: 7N60L
MainBoard: 090-6M181F-01 745-6M181F-02 LTA320AN01 12v WL32QS92
IC MainBoard: MST6E181VS-LF-Z1, W9425G6JH-4, FL032KIF (25Q32), MSH9010-LF, 3602M (8), 3503MP (8)
Tuner: AFT7 / W034G
MYSTERY LED
Model: MTV-3215LW
Chassis / Version: 090-6M181F-01
Panel: LTA320AN01 HD
MainBoard: 090-6M181F-01
IC MainBoard: CPU: MST6E181VS-LF-Z1, Flash: 25Q32
Tuner: AFT7 / W034G
Technical Specifications MTV-3215LW
MYSTERY MTV-3215LW
General repair guidelines for TV LCD LED
Repair and diagnostics of any electronic device, in particular MYSTERY MTV-3215LW, it is advisable to start with a careful external examination of internal and external elements. Based on visible external changes in the state of the components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before making the necessary measurements. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of the already known typical malfunction.
If the MYSTERY MTV-3215LW does not turn on, no control lights on the front panel light up or blink; therefore, there is a very high probability of a power module malfunction. In some cases, only the processor power regulator may be faulty. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the MYSTERY MTV-3215LW does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LTA320AN01 HD panel is likely. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
Repair of the motherboard MTV3215LW must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MST6E181VS-LF-Z1, Flash: 25Q32 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before replacing the AFT7 / W034G tuner, if there is no tuning for the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH  ----------->   MYSTERY MTV3215LW, Main: MTV3215LW, Panel: LTA320AN01 HD

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    KL-050-11601A-KD



 In case of failures in Winbond's SPI FLASH software, we recommend that you replace the chip itself with a new one. Sometimes Winbond microcircuits can recover for some time after high-temperature exposure, for example, heating with a soldering station or a lighter, which is sometimes enough to read its contents.

Repair MainBoard
The appearance of MainBoard 090-6M181F-01 is shown in the figure below:
090-6M181F-01
090-6M181F-01 can be used in TVs:
MYSTERY MTV-3215LW (Panel LTA320AN01 D03), MYSTERY MTV-3215LW (Panel LTA320AN01 HD), MYSTERY MTV-2415LW (Panel 1080p Full HD 1920x1080), MYSTERY MTV-2615LW (Panel KPL-260B1CE04).
Main features of the MYSTERY MTV-3215LW device:
Installed matrix (LED-panel) LTA320AN01 HD.
The required supply voltage for all nodes of the TV MYSTERY MTV-3215LW provides a switching power supply.
MainBoard - the main board (motherboard) is a 090-6M181F-01 module, using CPU chips: MST6E181VS-LF-Z1, Flash: 25Q32 and others.
The AFT7 / W034G tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AN01-D
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 20 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TV MYSTERY MTV-3215LW with LCD display LTA320AN01, diagonal size 32 "(81 cm) 16: 9 format. The required brightness of the screen 400 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 3000: 1. Edge LED backlighting is realized in the LED-panel of this TV - Edge LED. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems . Max PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:. MP3, MPEG4, JPEG.
The power of the sound system 10 W (2x5 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 x3, component, SCART, VGA, HDMI, USB. 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.
The power consumed by the TV in the operating mode from the network is 65 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The panel of the LTA320AN01 HD MYSTERY MTV-3215LW LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
Posted By: FRANK at 03:18
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