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Author Topic: Wonderboy bootleg jama distorted graphics  (Read 3458 times)

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telonio

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Wonderboy bootleg jama distorted graphics
« on: July 11, 2021, 08:08:35 am »
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

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Re: Wonderboy bootleg jama distorted graphics
« Reply #1 on: July 11, 2021, 08:53:48 am »
Get a magnifying glass and look for the cold joint?

Push on individual chips and see if the image distorts.

pbj

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Re: Wonderboy bootleg jama distorted graphics
« Reply #2 on: July 11, 2021, 09:53:31 am »
Unseat and reseat the socketed chips.