As the Game Boy Advance is over 2-decades old from when it was released, you may stumble across game cartridges that are not working correctly as it should. The result of this may be a damaged or corroded PCB due to misuse or in other cases where games were stored improperly. In the event that you have followed this guide, to no avail, or simply want to refresh your old games with brand-new, high quality PCBs as preventative maintenance, here are some sources for replacement Game Boy Advance cartridge PCBs.
Project ReBoard - ReBoard GBA
The ReBoard GBA is a high quality range, perfect for replacing a Game Boy Advance game cart PCB.
They are available to be purchased here: