Weird MSI Pro2A VRM Problem (technical)

w9design

Golden Member
Mar 1, 2000
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Recently, my motherboard started to make an odd hissing sound after rebooting from a period of heavy load. Allowing it to sit for awhile resolved the problem.

Yesterday, it started hissing continuously. Booting up flawlessly, it runs fine (it is now) whilst hissing. Oddly enough, when the hissing stops, the computer locks up. This happens somewhat randomly, but happens shortly after boot.

I traced the problem to the voltage regulator area, and further to a particularly large induction coil (at least I think that's what it is?). When I move it around, the hissing noise changes mildly.

I found that after a lockup, the MOSFETs and the accompanying chip are extremely hot. I pulled out the motherboard, and pointed a 41CFM case fan at the voltage regulator area. My system has yet to lock up, though I'm waiting for it to do so. The CPU itself is cooled by a Hedgehog with a 30CFM Evercool fan.

To eliminate all variables, I installed the same CPU, heatsink, video card, memory, and hard drive into a KT133A board at work. Ran flawlessly for hours running CC Winstone loops for 5 hours at 1466MHz. So it's definitely the motherboard.

Anyone with some electrical knowledge have any solutions or advice?

More importantly, How fast is the turnaround for MSI RMAs? I don't want too much downtime...