Date: Tue, 4 Oct 2005 02:25:15 +0100 From: Liam Proven <[EMAIL PROTECTED]>
The power /cable/ is known to be good. No idea about the PSU but it becomes slightly warm if left connected overnight. I have no other similar Macs to swap parts with. I have a 6100, 2 LC475s, a (dead) Classic II, a 7300/166, a Beige G3 and an old Powerbook - possibly a 145, I forget. Nothing I can swap PSUs or logic boards in and out from, though, I don't think.
Do you know anyone with a IIci or 7100? The IIsi power supply can be used to power one of those and vice versa. I wouldn't try it with any cards installed or hard drive load to speak of, but the power connectors are compatible. Also, the combo won't fit in the case so the test needs to be done out of the case on the bench.
However, it's sounding like you probably have leaky capacitors on your IIsi board. The IIci is subject to this problem and the IIsi is nearly identical only with half the SIMM sockets and no NuBus slots.
The surface mount electrolytic caps leak corrosive onto the board with age. Several of them are involved with the power-on circuitry, so the machine fails to power on, either because it needs the caps functional, or because the corrosive has eaten through a trace, contact or solder joint on the logic board.
This isn't that hard to repair with a bit of care, but it does require the motivation to fix it.
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