[UPDATE - VIC20 repair with 68766 EPROM]
This is an old post, preserved for reference.
The products and services mentioned within are no longer available.
I while ago, as part of a box of old computers, I acquired a Commodore VIC20. Specifically, the VIC20 CR (the 'Cost Reduced' version with the smaller main board and Commodore 64 style DIN power connector). Like the rest of the collection, it was a bit tatty and didn't work.