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RCA 32" TV (blows horizontal output)    
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glen65



Joined: 14 Sep 2008
Posts: 2

PostPosted: Sun Sep 14, 2008 1:56 pm    Post subject: RCA 32" TV (blows horizontal output) Reply with quote

I am working with an RCA model 32F530T TV.
The chassis number is ATC113-CD4.
The unit makes a constant chirp noise when plugged in.
I checked it out and found that the horizontal output
transistor was shorted, its a 2SC5148 with no internal
damper diode. I checked the surrounding components
and solder joints all appear to check ok. I replaced the
transistor but when I plugged the unit in it popped the
transistor and started chirping again. I'm thinking
that the flyback may be at the source of the problem.
However I have seen so many replace it in cases like
this just to find that it really wasnt problem and I dont
want to be among them. (Any help would be apreciate)

Something I noticed when replacing the HOT is that they didnt
use any heat sink compound on the transistor surface.
Is there any reason why I shouldnt use any?
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Wendell1980



Joined: 30 Dec 2007
Posts: 74
Location: Cambridge, Ontario, Canada

PostPosted: Thu Oct 23, 2008 5:57 pm    Post subject: Reply with quote

if you don't use any the transistor will overheat and fail again
so its recommanded to use thermal paste
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