general question


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general question

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maverickr
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Dec 7, 2007, 3:24 AM

Post #1 of 3 (801 views)
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general question	Can't Post

If the tv powers on and you get sound but no picture, what is this a symptom of? Could it be a bad HOT or a flyback? I tried adjusting the flyback but then all i get are the trace lines.

techchris
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Dec 7, 2007, 2:54 PM

Post #2 of 3 (791 views)
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Re: [maverickr] general question [In reply to]	Can't Post

if you can turn up the screen control and see flyback lines on a plain raster then you dont have a HOT problem.what you have is a video signal problem or blanking pulse problem.

rrobor
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Dec 8, 2007, 11:38 AM

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Re: [maverickr] general question [In reply to]	Can't Post

I agree with Chris, but would expand his blanking issue to the vertical chip. You can have vertical scan but have a fault in the protection which causes the picture to be blanked, so look at the vertical chip and check for voltage on the protection pin. This one is a nasty trap the first time seen.

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