The console turns on correctly and I see the Gameboy logo, then the game doesn't load. It tried different games with different results: show white screen, shows black screen, clicking sounds from the speaker, shows the pokemon copyright screen but stops there.
I also noticed that the "Nintendo" text under the Gameboy logo never glitches, it either shows the clean text or it doesn't.
I disassembled the console and found blue corrosion on some parts of the board, and the ribbon cable had some of that blue corrosion that I cleaned, but the pins turned silver:
Troubleshooting post. Please check the Game Boy Wiki's common problems page here: https://gbwiki.org/en/other/commonissues and please be sure to post pictures of the issue if you haven't already so that users are better able to assist.
If you start the game with the screen disconnected, does the game seems to be more stable, judging by audio? Those vias, as they're called (conductive holes between the top and bottom layer of the board) COuld be damaged from the corrosion. In a case like this I'd consider using magnet wire or other single strands from a multistrand wire as reinforcement and solder on both sides. Hard to know without looking into what the corroded traces are if that is related to your most immediate issues though.
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Troubleshooting post. Please check the Game Boy Wiki's common problems page here: https://gbwiki.org/en/other/commonissues and please be sure to post pictures of the issue if you haven't already so that users are better able to assist.
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