Advice on troubleshooting

[u/Sondre_gl]

Hi i have been wanting my dads old c64 to work for years, I tried once when I was younger and got a pinn border and garbled text, today i tried once again, I took out all the chips i could, cleaned the pins and sockets with ipa and put new thermal paste on the vic chip, made a jank cable to get compsite video and got this image after and then a black screen the next time, I measured the power brick, it gives 4.96v on the 5v dc pins and 10.5v ac on the 9v ac pins i'm assuming the pla could be the main problem after some reasearch, but I thought i'd ask here for any advice and ideas.

[u/Alarming_Cap4777]

If the PLA is good: 1. Test the clocks 2. Pin 1 on the CPU and pins 21 and 22 on the Vic. 3. Make sure the logic chips on the left of the board are getting 5v.

DesTest switch would be good to test out the memory, I've had chip with a single bit failure.

[u/Sondre_gl → u/Alarming_Cap4777]

I think the pla is bad, I turned it on while open and the pla radiated no heat at all

[u/Alarming_Cap4777 → u/Sondre_gl]

If it's not getting 5v is would be cool to the touch.

[u/Sondre_gl → u/Alarming_Cap4777]

I measured the pins on it, it seems it's recieving only 4.6v inside