To determine which is the cause of the problem, you can try booting up a game, saving, and then turning the console off, and removing the cartridge. If the C30 and/or C32 capacitors are dead, they need to be replaced with 330ОјF 6V and 100ОјF 6V capacitors respectively.If your replacement battery has its leads attached to it already, you can solder them into the board. Any compatible battery will do if you keep the original battery leads in the cartridge. Then, the battery needs to be removed and replaced with an equivalent coin battery (often times a CR2025). If the cartridge's internal battery is dead, the cartridge needs to be opened with a Gamebit screwdriver.This could have 2 causes: either the coin battery inside the cartridge (providing energy to the SRAM chip) has died and needs to be replaced, or the C30 and/or C32 capacitors connected to DC-DC converter board are faulty or dead. Should this not fix it, you can assume it being a CPU issue. Check for corrosion on the board, be mindful that sometimes it can be hiding underneath large components! (Yes, including the CPU) If it's all clean you can proceed with replacing the RAM chip. If none of this checks out, then it's probably something to do with the RAM chip or CPU. It could be the DC-DC converter board failing because of capacitor failure (see 'Saved games are being deleted' below). If the cartridge slot has been cleaned or replaced already, and you have another Game Boy (or compatible) system to check, then see if the console is deleting saved games. If every single cartridge is doing this, it could very well be an issue with the cartridge slot. Clean the slot or the cartridge contacts with isopropyl alcohol. This is most likely an issue with the cartridge itself or the cartridge slot. If that's the case, it's safe to replace the RAM and that should likely fix it.Д¬artridge not reading or crashing on startup

Removing it and booting will restore the nintendo logo to a solid bar, as it should be. Make sure the cartridge slot gold contacts are not mashed, otherwise it's probably the RAM chip being faulty. Nintendo logo corrupt without any cartridge inserted 3.1 Troubleshooting audio problems and replacing C31 capacitor.

Gameboy pocket