I have an original Gameboy classic in good condition, it came from a flee market, so I don't know the history.
It has one strange behaviour though.
I noticed in Super Mario Land 2, when selecting the safe-game, that I could only move to the right. (not going to the left.) (very few times he moves left though, i don't know why)
When I start a game I can move left and right, but on taping left the up button seems to be pressed as well.
Pressing the up button, also moves left.
When I jump, I can see that Mario jumps higher, as if the up button was pressed.
So somehow left and up seem to not work 100% correctly.
I opended the gameboy, everything is clean, also trying to only "press" left or up, did not solve the problem.
Any Ideas on the circuitry that is wrong?
From this video i saw the circuitry, but I am not sure what could wrong; if it is one of the diodes?
Clean the rubber contacts under the d pad that touch the circuit board (that's if it's anything like a normal game controller inside) with an earbud (q-tip) dipped in isopropyl alcohol, the finish on the pad is supposed to be matte, it gets shiny when it's dirty
Maybe you know this already but I was surprised initially that shiny was dirty and matte was clean. It might not be this anyway but it's worth a check, I'd probably clean the bit it touches on the circuit board too.
Thanks for the help; I think my explanation might not have been too great.
The Problem is that both left and up always work, but they also seem to trigger the other one as well; even if I activate them with a piece of wire/tip of a screwdriver. The silicon pads/carbon pads are working fine.
I think it is related to the curcuit board; maybe the owner bevore had a screen replacement or something, because there is some flux in some areas where I don't expect it from factory.... maybe something got screwed in that process.
No worries, sorry we couldn't be of more help. You explained it well enough, that's just all the suggestions I could offer with my current expertise.... Hopefully somebody with more electronics experience will notice this thread
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Topic: Gameboy Classic up button moves left, dpad
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