SGI Indigo, WTB Power supply? Burning smell?

ethan at ethan at
Sat Dec 10 10:55:24 CST 2016

> After sniffing the PCBs for a minute or so like bomb dog looking for a burned 
> resistor or cap.... I got to thinking that the PCBs are bigger than I 
> remembered. Better than I remembered.

Found the fried component! A surface mount yellow rectangular capacitor 
mounted on the bottom of the CPU board, somewhat near the audio DAC 
section. I wonder if all the similar caps that are on the bottom should be 
replaced. Maybe one went bad, but if one went then the others might be at 
risk as well.

After removing the PSU to open it up, I found that it's the R4K model 
power supply (Yay!) and there doesn't seem to be anything fried in it.

One odd thing, and I can't remember my SGI enough. I get the TOD clock 
error on the Indigo, and I get no startup chime tune sound. It had kind of 
a sputtering tick from the speaker (perhaps the fried cap is in the audio 
section.) Anyone know if the chime should play before the time of day 
clock error?

Ethan O'Toole

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