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challenger ts-2921 silver

Luis Eduardo Gómez
hace 5 años
hace 5 años
Hello yoreparo colleagues my case is the following, Challenger tv model ts-2921 silver, regulator: str f 6656-other circuits are tda 7297 another tda 8958j, symptom I connect it to the power outlet and the Stamby Led turns on and off Immediate power pulse And nothing happens, I proceeded to disconnect it from the power outlet and I heat the source with a hair dryer, I connect it and the LED turns on and then does not turn off then I press power and the TV turns on and it works perfectly changed a filter of 220 UF 35v that was a bit dry and still the same, then I heated a source filter with a 60 watt soldering iron for 40 seconds and connected the TV and nothing remains the same so I did with each source filter and the only one that I was successful with the C658 filter of 2,200uf at 25v, so I changed that filter thinking that this was the fault, I tried it and it did not turn on, the strange thing is that if I heat for 30 or 40 seconds that filter if you turn on the TV. Someone could explain the mystery to me and what would be the cause of the breakdown, this has happened to me with other brands and I could not find the solution
manolo karvalo
hace 5 años

Hello Friend. see if you have more serca filters from the regulator, for example, one of 47ufx50volt. and smaller change them for new

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Luis Eduardo Gómez
hace 5 años

Thanks Manolo I already changed the c814 filter from 100uf to 35v and the c822 filter from 1uf to 50v and it didn't work out just as bad I also changed the optocoupler q802 because when I heat it with the tip of the captin it turns on and it didn't work either

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Luis Eduardo Gómez
hace 5 años

Thank you, colleague Manolo, although I did not mention it from the beginning, I had already warmed the regulator and it did not work the same as the other two that are close to the Chopper, it only works by heating the ones I already mentioned

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Luis Eduardo Gómez
hace 5 años

No, it doesn't turn on

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manolo karvalo
hace 5 años

friend. Check the zener diodes may leak. I mean those that are close to the filter that you indicate when the TV is heated. turn on

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Luis Eduardo Gómez
hace 5 años

Hello manolo, thanks for your dedication in this case, you gave me an idea to find the fault was the C830 filter from 220uf to 25v which was devalued this filter is responsible for smoothing the voltage that comes out of a chooper pin and is going to connect to pin 1 of optocoupler 803. Thank you very much for your help.

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manolo karvalo
hace 5 años

friend. Today if you already turn on the TV.

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Luis Eduardo Gómez
hace 5 años

If friend Manolo with the change of the c830 filter it was perfect, thanks for your collaboration

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manolo karvalo
hace 5 años
hace 5 años
Hello friend, thank God that with the instructions to check the filters in contrast the c830. 220ufx25volt filter. That one was underrated and I didn't let the tv. turn on. Greetings
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