I thought I'd post this article on C-64 BASIC TROUBLESHOOTING.
I found it to be very helpful in narrowing down issues on faulty C64 mainboards. There are several articles on the internet that are similar. However this one I found to be easiest to follow.
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C-64 BASIC TROUBLESHOOTING GUIDE
Follow thru the steps suggested.
Test equipment is required like a multi-meter and an oscilloscope. I managed to scrape by on a very cheap logic probe instead of an oscilloscope like this one for a long time.
https://www.aliexpress.com/item/4000388 ... web201603_
I conducted measurements without the Diagnostic Cartridge installed.
Very Good Article on C-64 BASIC TROUBLESHOOTING (longboard styles)
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