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Topic: Gameboy Classic up button moves left, dpad

Posts 1 to 6 of 6

Bigfoot2000

Hi,

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?

Any electronics guys around?

Bigfoot2000

ralphdibny

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.

ralphdibny

Bigfoot2000

yeah, did that... does not help... left and top seem to have a problem.

Bigfoot2000

RedderRugfish

If they work but not all the time, then it probably has to do with the rubber button pads being worn out. Probably best to buy some replacements for them.

https://handheldlegend.com/collections/dmg/products/game-boy-...
I can't personally attest to the quality of these but they're only $3 and the reviews here look good.

Mario Maker 2: JN2-5GV-VTF
Latest Level: The Mario Repair Shop 361-D5D-1CG

Bigfoot2000

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.

in this youtube video it seems that some buttons share cicuitry over some diodes that were broken in that case.. https://youtu.be/urtX9P4zNws?list=FL0lIx0sXiVOI6ccikzpY3IA&am...

Bigfoot2000

ralphdibny

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

ralphdibny

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