Hi

I just took the back off and I think I found the vertical output ic.


Would it be LA7838, the vertical deflection circuit with TV / CRT display
drive IC?

THere are a bunch of caps around it too. Time to turn on the soldering
iron.



"Leonard Caillouet" wrote in message
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"Tube Audio" wrote in message
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I have a 27" crt Panasonic TV.

Sometimes the picture goes out, the screen goes black. The sound is
still there. A few minutes later it might come back.

Sometimes if you tap on the side or top of the tv the picture comes back.

This has been happening for a few months and has seem to happen more
often.


I am thinking it is a cold solder joint and I was thinking of removing
the back of the tv and resoldering some of the connections.

I know about discharging the crt to avoid shock hazard.

What are of the tv circuitry should I focus on re soldering? The area
that has the caps for the Horizontal Output Transformer? The video area?
The small pc board on the back of the crt?

Any ideas would help. I have a feeling that it is a cold solder joint
and not a worn component , but I may be wrong.

Thanks

Look for bad solder joints at the vertical output IC.

Leonard