Arcade Collecting > Restorations & repair

Wonderboy bootleg jama distorted graphics

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telonio:
I have a Wonderboy bootleg 2 layer pcb and as you can see in the photograph, usually it shows distorted graphics. Now when I move the pcb slightly, the graphics are fixed. So I guess that there must be some cold solder joints somewhere, but where?

https://i.postimg.cc/GhwvYTNX/20210711-143332.jpg


Thanks,

Mike A:
Get a magnifying glass and look for the cold joint?

Push on individual chips and see if the image distorts.

pbj:
Unseat and reseat the socketed chips.

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