My 512k was working fine for years and then recently went to turn it on and got chime but dark screen and silence. After approximately 1 minute, smoke started rising from top vents. Powered off. Removed case and then powered back on to see where smoke was coming from. Determined it was from the C2 capacitor on the analog board. Followed steps from JDW's video on recapping an analog board. Purchased appropriate C2 replacement from Mouser (647-UHE1E472MHD6) along with a C1 capacitor replacement. It was suggested by several vintage Mac friends that I replace this one as well since they're notorious for going bad. After replacing both caps and reassembly, I powered on the machine. Got the exact same result as before the recapping: Instant chime, dark screen, silence, and then after approximately 1 minute, smoke begins rising from the new C2 cap. Video here:
C2 Capacitor Replacement on Mac 512k Analog Board Smoking
- Thread starter DarylVogel
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