Clean C64 with poorly fitted label
Hmmm.. I've seen this sort of fault before..
Check this out.. Keyboard removed, TV switched off.. How do you know if it's still switched on? Ta-da!
The piggy back method gives you an educated guess identifying the faulty IC. Just push a known good memory chip over
the chip to be tested. If the fault changes/improves, you have a good chance of pin pointing the faulty chip without soldering!
Wonky label, wonky memory chip. Another happy C64 owner!