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-1917WD

Technical description and composition of the MYSTERY MTV-1917WD TV, panel type and applicable modules. The composition of the modules.
MYSTERY
Model: MTV-1917WD
Chassis / Version: V2J09
Panel: CLAA185WA06
Inverter (backlight): integrated into PSU
PWM Inverter: BIT3102B
MOSFET Inverter: AO4435, AO4804
Trans Inverter: BCK-19252WH 1010
Power Supply (PSU): TV1901-ZC02-01B
PWM Power: DM0565R
MainBoard: MSTV2203-ZC01-01
IC MainBoard: TSUMV26KE-LF, HT185WX1-100-TC05.0 X0.1, 25L4005A, 24C32P, TDA1517P
Tuner: F21WT-3BAR-E
Technical Specifications MTV-1917WD
MYSTERY MTV-1917WD
General recommendations for repairing TV LCD
Repair of the Mystery MTV-1917WD TV should begin with a careful external examination of all its components and modules. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
In cases when the Mystery MTV-1917WD TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the TV1901-ZC02 power supply module is most likely to be faulty -01 (B) or there is no standby power. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the Mystery MTV-1917WD TV does not have an image, but there is sound, you should make sure that the backlight power converter (inverter) is working properly. It is also necessary to check the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for excessive ESR. All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
In cases of attempts to repair the motherboard MSTV2203-ZC01-01, it is necessary to check the operability of the linear stabilizers and power converters of its microcircuits and, if possible, update the software (software). BGA chips can sometimes be diagnosed with local heating. Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Verification or replacement of elements TSUMV26KE-LF, HT185WX1-100-TC05.0 X0.1, 25L4005A, 24C32P, TDA1517P requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before changing the F21WT-3BAR-E tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to independently repair the Mystery MTV-1917WD TV without the appropriate qualifications and experience can lead to its complete non-repairability!




The appearance and voltage measurements at the control points of MainBoard MSTV2203-ZC01-01 are shown in the figure below:
MSTV2203-ZC01-01
MSTV2203-ZC01-01 can be used in TVs:
BBK LT1929S (Panel F21WT-3BAR-E), BBK LT1529S (Panel M156MWR1), MYSTERY MTV-2206W (Panel CLAA216WA01), MYSTERY MTV-1906W (Panel M190MWW3), MYSTERY MTV-1607w (Panel M156WWR190WWR Panel BOE HT185WX2-10), MYSTERY MTV-2417WHD (Panel M236MWF1), MYSTERY MTV-2407WH (Panel V236H1-L05 Rev: C1), MYSTERY MTV-2217WD (Panel CLAA215FA05), MYSTERY MTV-1917W18W (CLA.
The appearance of the power supply
Main features of the MYSTERY MTV-1917WD device:
Installed matrix (LCD panel) CLAA185WA06.
To power the backlight, a converter is used, combined with a power supply, controlled by a BIT3102B PWM controller. A BCK-19252WH 1010 transformer is installed in the inverter converter. Keys of the type AO4435, AO4804 are used as power elements of the inverter.
The necessary supply voltages for all nodes of the MYSTERY MTV-1917WD TV are generated by the TV1901-ZC02-01B power supply module or its analogs using DM0565R microcircuits.
MainBoard - the main board (motherboard) is an MSTV2203-ZC01-01 module, using TSUMV26KE-LF, HT185WX1-100-TC05.0 X0.1, 25L4005A, 24C32P, TDA1517P and other chips.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
MYSTERY MTV-1917WD TV with CLAA185WA06 LCD display, 19 ”(48 cm) diagonal size in 16: 9 format. 250 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 1000: 1. It is possible to 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 PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in with . Andartah 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats: MP3, MPEG4, VideoCD, SVCD, Picture CD, JPEG.
The power of the sound system 3 W (2x1.5 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, component, SCART, VGA, HDMI, USB. 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: 800x600, 1024x768.
The power consumed by the TV in the operating mode from the network is 60 watts.
Dimensions: With stand 642x444x209 mm, Without stand 570x345x70 mm.
Attention! The CLAA185WA06 panel of the MYSTERY MTV-1917WD 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 06:03
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