Either the board or something connected to the board is drawing a load or creating a no load situation, if the area the voltage goes to opens up the voltage will go up .
If you are a gambler replace the power board and find out.
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Have a vzio e420va power at supplyboard goes up and down12v goes up then down 24v does same thing from 24v to 15v then back up to 24v also no 5 volt can this be capacitors can't see anybulging
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