The only practical way to check chips is by substitution. The easiest way to do that is by inserting each suspected chip into a working computer that already has all chips socketed. I made a test board for just that purpose. At the very least, you need a source of known good chips for test purposes. If you don't want to go to that much trouble to diagnose the problem, you will probably be better off hunting up another C64.
Chips are hard to find and expensive.