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.
 
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