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gnclmorais hellogeri there's a LOT on youtube that's useful - particularly the vertical line fix that hellogeri mentions. If you're UK based, ebay is probably easiest starting place, if US, I keep seeing "I bought this for $11" so fleamarket/etc. A solder iron is needed, and if you want to fix –
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gnclmorais hellogeri —power or sound issues, then a multimeter at the least. Oh, and probably a working reference gameboy is useful so you know how it's supposed to work. Horizontal lines are *very* hard to fix, and "screen cancer" (I hate that name) is near impossible (always on pixels).
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gnclmorais hellogeri But the rabbit hole can be quite fun too: remysharp.com/2022/02/05/my-hardware-adventure-with-a-gameboy-pocket (well, this is _my_ idea of fun! 😃 )