Can't get famicom cart to work.

[Dendy]

Hi all!

Recently purchased Mickey Mouse 3 famicom cart in good condition. But when I tested it I got scrambled graphics.
At first I clean the pcb pins many times. Those looked like never used so cleaning was not really necessary, still same scrambled graphics.
After that I opened the shell to better inspect the pcb. Looked good to me, although I noticed one oxidized pin. I cleaned the pin and thought that was the problem. Unfortunately no improvement.
Anyone familiar with this problem?
Bitrot?

[P]

Bitrot? No, it could be bad contacts, an aged AC-adapter, a cracked solder point, a broken trace, a fried chip (CPU, PPU, RAM etc) and many other things.

Bitrot is more of a problem with floppy disks, optical discs and even PROMs, I've never heard of mask-ROMs going bad (they will eventually but it will probably take many many more decades).

[Dendy]

Thanks! I will try to examine pcb for possible broken traces. It had one oxidized pin, may be I should start there.

[fredJ]

I think it's a serious problem.

If your console works with other games, this one probably has a dead chip.

[P]

I'd wager not because of bitrot though? If it's one of the ROM chips I'd guess it's damaged for some other reason (same as with CPU/PPU or RAM). But I don't really know.