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Tube TVs

TV Admiral model K2102 Chassis K20SA205P does not turn on

jaime2017
hace 5 años
hace 5 años
Hello friends, who could help me with this TV, they bring it to me from another workshop and it does not turn on, when I uncover it in front of the sky it tells me that the other technician had repaired it but on the plate I put diesel fuel according to clean said plate, the tv lasted only 1 week and and it went off. When the client brings it to my workshop, I check it and find the 3DD2102 horizontal transistor in short, some loose welds: I placed a D1554 transistor, but the TV does not turn on, I measured the volatejes and all are present. This tv has the LA76950N7N57T3E as a micro jungle. When I turn on the red LED, it goes out, and all the source voltages are present and I also measured the voltages of the integrated vertical LA78040 and they are all good. who could help me in this fault that I can't find how to get to it.
elion24
elion24
328
hace 5 años

Keep looking for cold welds ... re-solder the quartz crystals (oscillators), the micro ...

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jaime2017
hace 5 años

I already did that, friend, I'm working on that.

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Javier Chavez C
hace 5 años
hace 5 años
What voltage you get in B both in STAND BY and on the ON command. ? What voltage do you get in the collector of the DRIVER Horizontal transistor in both STAND BY and the ON command?
jaime2017
hace 5 años

friend and the tv I managed to turn on but now does not tune channels. the tv had the damaged horizontal transistor and the drive transformer, I change it and the tv turns on, but there is no video or audio, however I tested it through the A / V inputs and there is if I have perfect audio and video, if some of you Do you have the data to record the original eeprom of this tv please.

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Javier Chavez C
hace 5 años

Check the good condition of the tuner channels and working voltages on your pins

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jaime2017
hace 5 años

If I measured the voltages and everyone is present, my friend Javier, I tell you this TV, another technician manipulated it, and the client told me that he threw the gasoil to the plate with a brush according to clean the plate. I do not know if I am affecting the operation of the TV, I proceeded to clean the board with a special liquid to clean electronic boards, but I have not yet uncovered the tuner. On the other hand I found the damaged eeprom memory, and I need the data from the original memory to be able to record it,

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jaime2017
hace 5 años

Friends of the forum and solve this TV's fault, place a programmed eeprom, enter a serice mode and change some items and voila. thanks to me javier x your collaboration.

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Javier Chavez C
hace 5 años

Congratulations !!!
Until a next opportunity.

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