I have a strange issue with my Gameboy Classic (DMG-01) that I am trying to fix. Bootup sequence is good, with logo and sound but everyting dissapear after a second and no game is loaded.
I cleaned everything, replaced cartridge socket, resoldered CPU and memory but no luck so far. What is interesting that everything works perfectly IF motherboard is heated with a hotair.
Also what is worth to mention Tetris works fine regardless temperature but no luck with Super Mario Land 1 and 2 at 'normal' working temps.
Could you please advise or tell me what else to check? Thanks a lot!