No conclusions here, just and observation regarding my black screen C64...
I measured the temps of the various chips with a cheap infra-red non-contact thermometer, and found the Kernal ROM to be running at 160F (yikes), and the memory chips to be between 90F and 118F.
A subsequent test of the memory chips in my dramarduino showed that the 3 chips that were in the low-90s in temp passed the testing. The 5 that were in the 105-118F range all fail testing. Repeating the memory test the next morning, to eliminate temperature as an acute variable, did not change which chips tested good or bad.
So, thought it was an interesting observation and maybe useful for quick-and-dirty triage.
I measured the temps of the various chips with a cheap infra-red non-contact thermometer, and found the Kernal ROM to be running at 160F (yikes), and the memory chips to be between 90F and 118F.
A subsequent test of the memory chips in my dramarduino showed that the 3 chips that were in the low-90s in temp passed the testing. The 5 that were in the 105-118F range all fail testing. Repeating the memory test the next morning, to eliminate temperature as an acute variable, did not change which chips tested good or bad.
So, thought it was an interesting observation and maybe useful for quick-and-dirty triage.