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Tv LG 21fg5rl chassis cw81b vertical failure

Moises Martinez
hace 5 años
hace 5 años
Good friends that I would like to ask for your help I have a LG TV model 21FG5GRL chassis CW81B which does not come out of stanby, I give power order and the TV only makes the attempt to turn on and returns to stanby. I measure in the source filter c803 = 159.3v, + B = 111v. In vertical there is no voltage on any leg take it out thinking that it is short but even then the voltage does not appear. Remove the protection in Q16 and the TV turns on only with the common line when the vertical fails. There is sound with the antenna on. I follow the track and there is no voltage until I reach the flyback leg marked with 26v and they do not appear anywhere. They could help me how to deal with this fault.
franciscovallarta
hace 5 años

Comment on the voltage you have in the tansformed driver or in the collector of the transistor driver both in stanby and when giving the ignition order, for this test first put the tip of the tester in the place to be tested and then turn on the TV. comment that voltage .... greetings

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ELECTRÓNICA FCJ VENEZUELA
hace 5 años

Friend, I think you inverted the voltage values that you placed in your question because if you say that the TV turns on and presents the vertical fault line then the voltje of + B is 111 and the main filter is 159 volts. I would say that FR301 is open.

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Moises Martinez
hace 5 años

Amigo ELECTRONIC you are right I have already corrected my error with the data, thank you very much. Francisco friend in stanby 106v and lit 110v

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Moises Martinez
hace 5 años

Already change the fr301 0.05 did not have an equal only had a 0.22 ohm I do not know if you can leave with this or it would bring some kind of problem. The image opened 26v were restored. I only have a few delay lines at the top

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manolo karvalo
hace 5 años

friend. if you have not changed filters that indicate those lines it is by devaluated filter

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Moises Martinez
hace 5 años

Thank you very much friend Manolo karv for your help I will change them. Blessings

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ELECTRÓNICA FCJ VENEZUELA
hace 5 años
hace 5 años
Friend did you check that FR301 is not open?
Moises Martinez
hace 5 años

Friend, then I try to measure it but I don't get a result according to the diagram, the fr301 is 0.05 / 0.5w but the tester doesn't give me any value

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ELECTRÓNICA FCJ VENEZUELA
hace 5 años

If it doesn't give you any results, it's open, change it to a 1 ohm if you don't have an equal.

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Moises Martinez
hace 5 años

I changed it to a 0.22 ohm and it has already opened the screen, it only has some delay lines at the top.

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ELECTRÓNICA FCJ VENEZUELA
hace 5 años

The fault is now solved friend change the capacitors of the vertical and ready, value the solution and close the post, greetings!

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Moises Martinez
hace 5 años

Thank you very much friend ELECTRONIC for your help. Successes and blessings

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