K4900 intermittently loses red after cap kit

alejandromad

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Donor 2011
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It'll be working fine ... then the red will drop. If I turn that up, with the pots related to 'red' on the neck board, it gives me some red again. Of course, I am over driving it at that point and when it flips back to it's "normal" state it's pretty much all red.

Sometimes it flicks in and out a few times... other times it stays gone for minutes.
Cycling power on the cabinet doesn't really affect it... meaning it doesn't come back immediately after turning off then on.
I have put 4 different known working boardsets in the cabinet and all of them do it so it's not the game.

So, what did I do, or not do, to cause this?

I did the cap kit because the images were sort of 'streaky' during game play and 'washed out' looking. The colors are much more vibrant now... other than my red issue.
 
Broken solder joints, almost sure. Go over the entire chassis and touch everything up.

Could be a flakey pot too, but I'd bet on solder joints. If the joints don't fix it, then replace the pot.
 
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