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(SOLVED) ASUS P5LD2-VM - CPU stuck in reset, potentional VRM issues

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First post, by kotel

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Hi

Recently I got a lot of old ewaste. One of them being this ASUS P5LD2-VM board. Visual inspection revealed no issues apart from 3 1000uF 16v caps in the VRM which I've replaced with fresh nichicons (yes I did double check if I soldered them in the correct orientation). Went to power it on and was greeted with CPU stuck in reset. Both NB and CPU are stone cold. Measuring the VRM coils reveals no voltage on them. Used both an C2D 2.93gHz and an Celeron 430.
Since I am very inexperienced in VRM repairs, I turn to this wonderful forum for help with fixing this board.

Last edited by kotel on 2025-01-26, 10:01. Edited 1 time in total.

"Sent on a mission, to protect the last treasures. Through struggle and strife we can see the light. Even if our mission is partially complete, Our efforts are not in vain.
Let that be our legacy."
-Stronghold 5-5

Reply 1 of 2, by kingcake

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When you say the CPU is stuck in reset, have you actually observed the RESET signal?

If so, it's possible that the VRM is causing it. Sometimes the VRM controller has a POWER GOOD output that feeds into the reset circuitry either in the chipset or discrete logic. Usually the same place the PSU POWER GOOD feeds into.

Reply 2 of 2, by kotel

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So it seems like the CPU (c2d) is unsupported on this revision... An p4 works fine.
Silly me

"Sent on a mission, to protect the last treasures. Through struggle and strife we can see the light. Even if our mission is partially complete, Our efforts are not in vain.
Let that be our legacy."
-Stronghold 5-5

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