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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Friday 1 May 2020

REPAIR / SERVICING TV MYSTERY MTV-4331LTA2

Technical description and composition of the MYSTERY MTV-4331LTA2 TV, panel type and applicable modules. The composition of the modules.
MYSTERY LED
Model: MTV-4331LTA2
Chassis / Version: MSA6284-ZC01-01
Panel: LC430DUY (SH) (A1)
LED backlight: LED42D15-01 (A) 3034201520S
T-CON: 6870C-0532A 6870S-1932C 6870S-1933C
LED driver (backlight): integrated into PSU
PWM LED driver: OCP8128
MOSFET LED driver: 60R360Q
Power Supply (PSU): TV5502-ZC02-01
PWM Power: IC_Power
MOSFET Power: TEA1716, SY8113B
MainBoard: MSA6284-ZC01-01
IC MainBoard: CPU: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0, ETHERNET: PM44-11BP, AUDIO: OB6220VP, SPI FLASH: MX25L4006EM1I-12G (MX25L4006E)
Tuner: DVB-T2: MSB102KT
Control: WIFI: IP2000-ZC12-01 (A) 30382000171
Technical Specifications MTV-4331LTA2
MYSTERY MTV-4331LTA2
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The MYSTERY MTV-4331LTA2 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
With such manifestations, a malfunction is most likely to be detected in the TV5502-ZC02-01 power supply module. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (TEA1716, SY8113B) and rectifier diodes of the converters for possible short circuit.
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.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) IC_Power, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard MSA6284-ZC01-01 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 some cases, chip repair may be necessary to repair the MB (SSB) board - CPU: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0, ETHERNET: PM44-11BP, AUDIO: OB6220VP, SPI FLASH: MX25L4006EM1I-12G new 12G or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages at the terminals of the DVB-T2 tuner: MSB102KT. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, remind users! Attempts to self-repair a TV MYSTERY MTV-4331LTA2 without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!

Repair MainBoard
The appearance of the MainBoard MSA6284-ZC01-01 is shown in the figure below:
MSA6284-ZC01-01
MSA6284-ZC01-01 can be used in TVs:
MYSTERY MTV-4331LTA2 (Panel FullHD_CMO216_H1L01), TELEFUNKEN TF-LED48S39T2S (Panel LCS480HN08-8).
The appearance of the power supply
Main features of the MYSTERY MTV-4331LTA2 device:
Installed matrix (LED-panel) LC430DUY (SH) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OCP8128 PWM controller. As power elements of the LED driver, keys of the 60R360Q type are used.
The required supply voltages for all nodes of the MYSTERY MTV-4331LTA2 TV are generated by the TV5502-ZC02-01 power supply module or its analogs using IC_Power microcircuits and power switches of the TEA1716, SY8113B type.
MainBoard - the main board (motherboard) is an MSA6284-ZC01-01 module, using the following CPU chips: MSD6A628VXM, EMMC: THGBMFG6C1LBAIL, DRAM: K4B4G16460-BCK0, ETHERNET: PM44-11BP, AUDIO: OB6220VP, MX25LI FLASH (MX25L4006E) and others.
Tuner DVB-T2: MSB102KT provides reception television programs and tuning to channels..........

MYSTERY MTV-4331LTA2 TV with a FullHD_CMO216_H1L01 LCD display, diagonal size 43 "(109 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast ratio as the ratio of maximum brightness to minimum is 5000: 1. The LED screen technology is implemented in the manufacturing technology of the screen of this TV model.The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
MTV-4331LTA2 TV has built-in SMART Software and pre-installed Android Operating System. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x3, USB x3, Ethernet (RJ-45), Wi-Fi 802.11n. 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, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Attention! The FullHD_CMO216_H1L01 panel of the MYSTERY MTV-4331LTA2 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 05:40
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