G0-7 scrolling both ways

paul400

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pretty much brought this one back from the scrap pile, it was missing alot of parts and flyback was bad.Now I cant get it locked in either direction so far I replaced
1. flyback
2. HOT
3. V.R.
4. all transistors in sync circuit
5. IC. chip
6. capkit "including bipolars"
I also reflowed eveything in the sync circuit and reflowed around the IC. and Pots.
Note all the trans in the sync circuit were already replaced and the IC is socketed before I got it so I assume the scrolling is why the chassis was scrappped. whats next please??
 
Since it sounds like everything was replaced I think you are looking at a "board" problem rather than a "component" problem. Look for hairline cracks in the traces around the flyback and the sync circuitry. Hold it up to a bright light and flex the board. If you don't see any cracks that way, you have to pull out your meter...
 
I had a G07 that was completely rebuilt that was doing the same thing. After trying a SHIT ton of stuff and wasting a bunch of time, it turned out being my PCB. :eek:

Make sure you have a working board in there :D
 
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