Probably a short, an issue with scoring data line(s), or failed chip(s) related to scoring.
I realize that's kind of vague, but you'll need to do some troubleshooting to narrow things doen. What have you tried so far?
(Topic ID: 227075)
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Quoted from waffen_spain:I already used my fiberglass eraser
Personally, I try to avoid using fiberglass erasers and sandpaper and use a pink rubber eraser instead. The material for edge connector contacts is pretty thin, and I prefer to avoid making it thinner. Most of the time, there's only surface coating/grime/corrosion, and it really doesn't actually need sanding--just cleaning.
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