Editing Commodore 64C (section)

== Troubleshooting Highlights (Differences vs. Bread-bin)==
{| class="wikitable"
! Symptom !! C64C-specific suspect !! Notes
|-
| Black screen, no border || DRAM (U10/U11 41464) or Super-PLA || PLA failures rare but possible if it overheated
|-
| No sound || 8580 SID missing +9 V OR 7809 blown || 9 V derived from AC; check fuse F1
|-
| Keyboard dead || CIA U1 (8521) || Same matrix as original C64
|-
| Pink/green raster noise || 8701 clock chip || Swap with known good or install oscillator mod
|}

For fault-finding refer to the [[Commodore 64C Troubleshooting Guide]] (companion page).