MOS 8502R0 CPU for the Commodore 128
A faulty CPU in a Commodore 128 can be the cause of many faults, including blank screens (make sure you didn't just leave the 40/80 column switch down though!), corrupt text and entering the monitor on startup.
These chips are remarked and cleaned but are tested to be working in our own Commodore 128, and of course are guaranteed to work for you too.