The 6526 (CIA) was the first chip I could fix by replacing the broken one to another functioning one. Those CIAs are at high risks, because they are directly connected to the 2 joystick ports of the C64. You just need to touch some pins at the port and you probably grill your CIA with static electricity. Unfortunatly the CIAs getting rarer and rarer, because the cannot reproduced by FMPGs until today, so you need to get a space CIA from another machine. Maybe in the future this will work with replications.