Asus P4P800 SE dead

[goodpsusearch]

Re: Asus P4P800 SE dead

The caps are going to be late... Not that I care, now I am worried about my main computer recap project.

[goodpsusearch]

Re: Asus P4P800 SE dead

The p4 processor I'm using to test that board has 1.75V nominal voltage.

I tested the Vcore caps voltage with my multimeter and I got a steady 1.83V.

Does this rule out that the motherboard doesn't post due to bad Vcore caps?

[PCBONEZ]

Re: Asus P4P800 SE dead

The p4 processor I'm using to test that board has 1.75V nominal voltage.

I tested the Vcore caps voltage with my multimeter and I got a steady 1.83V.

Does this rule out that the motherboard doesn't post due to bad Vcore caps?

No.
You would need an o'scope to check the ripple.
.
That also doesn't sound like a good reading for DC.
It looks like the VID is screwing up and setting the wrong voltage.
That could be a small cap or an SMD part [cap, diode, resistor] causing the controller IC to get the wrong voltage or that is corrupting one of the VID signals to it.
.

[PCBONEZ]

Re: Asus P4P800 SE dead

I have a P4C800-E Deluxe here which uses this IC for that.
https://cdn.badcaps-static.com/pdfs/...5a7e781990.pdf
There's a fair chance you have the same IC.
Page 7 shows the voltage steps which are 0.0125v.
.

[goodpsusearch]

Re: Asus P4P800 SE dead

I took out all the OST caps from the VRM and tested with the ESR Micro Meter. It showed 0.00-0.01, so the problem isn't capacitor related.

Thank you very much for the help! I will keep the board for parts, unless I have free time to mess more with it and look for faulty ICs.

[b700029]

Re: Asus P4P800 SE dead

Dead southbridge is a common sign of 5VSB overvoltage, like from a Bestec gone crazy.