Question about Sony FD Trinitron WEGA KV-27FS120 27" TV

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TV powers on then shuts off

I turn the TV on, the screen is looks green with static, then turns off by itself. I have another model just like it for parts, is there something I can inerchange myself?

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Hello catapracht, It looks like you shutdown circuit is turning the TV off due to a problem in the HV section. What you are seen is possibly a green cathode short and some blooming occuring. These will caused increased anode voltage and trigger the shutdown circuit. At this point I would not suggest blind swapping of parts but rather you find a repair shop on FixYa.com, or find a shop close to you to have this problem dealt with. Because these are dangerous voltages you will be dealing with and without the training and knowledge of TV repair it would not be adviseable to do these repairs yourself. However you can be of assistance in have this information ready for the repair person. Thank you, I hope this helps. Shuttle83

Posted on Sep 07, 2007

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Posted on Jan 02, 2017

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You almost certainly have a bad picture tube. The green screen was from one of the elements inside shorting out. The static sound you're hearing is the high voltage arcing out through the end of the picture tube to other parts inside the set. It's more economical to buy a new TV than to repair this one.

Sorry to have such good news, but this is one of the ways a picture tube can go bad, and it happens quite often.

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1 Answer

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It is possible one of the internal fuses blew out.
It could be a bad horizontal outut transistor.
It could be a bad secondary of the power supply went bad
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1 Answer

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Al

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1 Answer

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How old is this TV?
Sounds like it has high voltage failure.
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1 Answer

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Sounds like its going into auto protect shutdown. Try holding the imputand menu bottons in together for 5 seconds and see if the green light blinks out a series of blinks. If so notice what they are, should be a 2 digit code if its going into shut down. If not its a power supply issue. Also you can look the boards over for evidence of CRT fluid leaking on the boards, I have seen this happen alot to the VS models it causes corrosion of the components and you will experience no start up condition like the one your describing.

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