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Unread postPosted: Thu Jan 17, 2013 9:51 am 
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Joined: Tue Aug 25, 2009 10:05 am
Posts: 3
I have a broken SGI Indigo I'd like to fix, but I have no idea where to start.

The most obvious problem is that shortly after power on - two seconds, maybe three - a noise starts coming from the internal speaker. The sound becomes louder and louder with every second. No startup chime, no output on serial console.

My initial thought was a broken power supply, but a PSU repair guy I've found claims that power supply is ok and voltages are correct and clean. He also claims that he tried to bend the "mainboard" - probably the CPU board - slightly and this sometimes leads to the startup chime.

Any suggestions are welcome. Thanks :-)


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Unread postPosted: Thu Jan 17, 2013 3:18 pm 
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Joined: Tue May 17, 2005 12:52 pm
Posts: 75
Location: Delft, the Netherlands
I don't really have a suggestion what can be wrong - but I would be interested in anything you find out. My Indigo R3000's speaker stopped working (no chime at boot-up) after i replaced the TOD battery. A little later the PSU shorted out, check the thread under "getting started" for details.
Having to bend the board suggests that there is something wrong with the attachment to the backplane?

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Unread postPosted: Fri Jan 18, 2013 4:03 am 
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Joined: Mon Nov 12, 2007 8:54 pm
Posts: 1321
Location: Berkeley, CA, USA, NA, Earth, Sol
trasz wrote:
... a PSU repair guy I've found claims that power supply is ok and voltages are correct and clean. He also claims that he tried to bend the "mainboard" - probably the CPU board - slightly and this sometimes leads to the startup chime.

I'm out of my depths here, but my reaction is A) don't bend the boards while powered; B) if the board he's bending is fitted to a backplane slot, it isn't seating well, try cleaning the fingers (if relevant) and re-seating; C) if it was more like an Indy or Indigo2 mainboard, I'd want to carefully examine the solder joints of the through-hole pins on any connectors like power, backplane, etc. The close to the point of flexing, the more closely I'd examine them. But I humbly defer to somebody with relevant training in these matters.

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