Why is the inside of the 3ds cartridge sticky?

Hi @timbyto,

Try cleaning off the remaining residue as seen in the 2nd image on the left at the bottom.

You could use a small flat blade screwdriver to VERY GENTLY (cannot express it strongly enough) scrape the residue off when the IPA is applied to it.

Do not make the board/tracks too wet as this can cause other problems.

Do little bits at a time and allow to dry or move to another small area.

Without knowing if the residue is conductive or not (but assuming that it is) you would have to ensure that all tracks/connections that are not obviously connected to each other, shouldn't be covered by the residue that may be linking them.

Once totally clean hopefully it will work unless the chip was damaged by having power connected to it with the residue there.