Who knows a lot about the DMG?

Yea I work on them, but I could never figure out why one of my DMG's Left button does not work.
Is it the ribbon cable, the Mobo, something else?
I really like this Gameboy because it has no missing lines and the contrast is Amazing for such an old Gameboy.

PS. I'm working on a new DMG paint job, hopefully getting a back light.
 
I recommend cleaning the Motherboard with a q-tip.
Also clean the rubber membranes and the buttons.
If that doesn't work I know a trick I can tell you.
 
Look for the paralell traces going from buttons to ribbon. Clean the ribbon contacts too.
 
I've narrowed it down to being the back part the Motherboard,(the part with the game cartridge). I don't know where to go from here.
 
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