Question about IBM (25P3294) Motherboard

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X3500 could not start (power on)

IBM x3500 server, when i put power cable in the power supply unit, the light path shows error (service porcessor bus) sometimes no error, the green light blinkin, but when i push the white button to start server ; the cooling fan spins one time and the sas hdd light blinks for a sec after that no responce, the server could not start.
1. change the power supply hole unit
2. change mother board

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  • Anonymous May 24, 2009

    hi me facinmg the same problem ..



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Suggest you change the power supply unit. 'Sounds' like a faulty power supply.
Suggest Electrolytic Capacitors have gone bad, in the power supply unit.
Check the link below, to see what Electrolytic Capacitors look like, and what they look like when they have failed. These capacitors don't Always show the visual signs when they fail, but most of the time they do.

I do not suggest you open the power supply unit chassis to observe closer though, as the capacitors can hold a charge for a L-O-N-G time. Sometimes weeks, or months. (Sometimes up to a year)
These capacitors are designed to slowly build a charge, then release it all at once. Should your fingers contact the terminals, of any of the larger capacitors, they could discharge their charge to You!
These could result in a bad shock or worse. (Even if your fingers contact a circuit that the capacitors are in, if your fingers complete the circuit, you'll be the recipient of the released charge)

Power supply unit unplugged from power, you can take a flashlight, and look through the ventilation holes, or slots. See if you do observe any bulging, or leaking capacitors. When they leak, there is a yellowish, or brownish ooze that comes out. It may come out of the top, or bottom of the capacitor.

At the top of the capacitor is an X, or this -> lK. It this is split open, you have a bad capacitor.


Posted on Apr 19, 2009


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