Macintosh Performa 5260/CD – Bad resistor?

[jgstratton]

I have a Macintosh Performa 5260/CD that appears to be dead. When plugged in and turned on, it gives a faint clicking sound, no video, no chimes. On disassembly, I noticed like a fine soot. Pulling the power supply board, I found what appears to be a burned up resistor (“r814”?). However, since the old part is toast, I don’t know what to replace it with.

Can anyone point me at specs for this board? Or even a photo of a board? My understanding is that this all 52XX share the same form factor, so if I could get the specs for one of those boards it would probably work. 54XX might also be similar (however, they are PCI not Nubus, so who knows).

I’m not sure I want to just wing it on a power supply. I’m also not sure if this is the only issue with this machine, but it does appear to be at least the most obvious problem. If I can get this running for the price of a resistor, then it would be a sin for me not to at least give it a shot.

 

[The Salami Boss]

Is this one of those interesting PSUs that has two connections to the motherboard? You can rig an ATX PSU to run it but you'll be running stuff to both motherboard connections and to get soft power you'll need some kind of adapter. I think the PSU is all that really goes wrong on these, but I may be off by a generation or something.