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Re: Video and/or Power problem - Suggestions please!
Posted: Tue Mar 29, 2022 9:15 am
by Silvester
Looks like the VP12 line is being ground by UHF can (top track in image under M1 legend).
Though I don't understand why IC28 would overheat
Re: Video and/or Power problem - Suggestions please!
Posted: Tue Mar 29, 2022 2:55 pm
by Pr0f
Silvester wrote:Looks like the VP12 line is being ground by UHF can (top track in image under M1 legend).
VP12track.JPG
Though I don't understand why IC28 would overheat
12v is used by the video colour encoder chip - 1377
Re: Video and/or Power problem - Suggestions please!
Posted: Tue Mar 29, 2022 3:58 pm
by Silvester
Pr0f wrote:Silvester wrote:Looks like the VP12 line is being ground by UHF can (top track in image under M1 legend).
VP12track.JPG
Though I don't understand why IC28 would overheat
12v is used by the video colour encoder chip - 1377
Yes, but I don't understand how shorting +12V to ground (if that is what happened) would cause IC28 to overheat.
Re: Video and/or Power problem - Suggestions please!
Posted: Mon Apr 04, 2022 11:29 am
by Harbars
I did have a poke around to see what might actually be interfering - it's actually the bottom of the can pressing down (component side) but it wasn't at all obvious. I've placed a strip of plasticard under that edge of the can for now. I'd imagine finding out for sure would involve removing the can - not sure I can be bothered with that, and am now away for a few weeks. As long as it works I'm happy although I'd still like to get to the bottom of it.