IBM 49P1599 Rev 1.1

[Solder Boy]

This is a stumper or maybe I have done something wrong, this is an IBM motherboard and when I initially fired it up before recapping it, it didn't POST and no beep codes at all.

The bad caps in question were 16V 3300-3900 uf one by the 4pin ATX connector, one by the chipset and 2 directly behind the onboard video port.

I didn't have the exact replacement caps for these so I went down to 10V 1800

Well good news is now I get 1 beep indicating normal post ( but no picture on monitor) Bad news it waits maybe 2 minutes then I get 1 long beep followed by 2 short beeps.

Checked the rest of the caps and they all test fine.

Oh ya boad turns on by itself.

[Lance Thornton]

Re: IBM 49P1599 Rev 1.1

You can's go lower on the voltage if the originals are on the 12 volt rail. Otherwise, you've created a small ticking timebomb. Personally I'd try again with the same capacitance and voltage if possible. Good luck.