PC Troubleshooting for PSU and Motherboard

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danielnalamia

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Dec 24, 2017
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Today I started building my PC and I first was going to test to make sure the it would POST. When trying to post a plume of smoke came from the top of the motherboard and I thought It was fried. After looking it over I couldn't find where it was damaged. I then tried my other PSU I had in another case and it posted just fine. So I thought the PSU was the problem. I tested the PSU at my work with a PC/SPS Tester. It showed all the correct LEDs such as +3.3V, -12, PG, +5VSB, +12V and +5V. I'm not that great with power supplies so I'm not sure if this means that the PSU is a good PSU. The last thing I tired was testing the PSU to another Motherboard and it posted to the BIOS just fine. Also it has been running Memtest for the past couple of hours to see if anything happens to the PSU. I need to know what is the most likely cause of the smoke. Is it a bad motherboard or PSU? I find it strange that the PSU worked with another motherboard and not the one I bought.

Here is my build:

Threadripper 1950x
Corsair H100i
X399 AORUS Gaming 7 (rev. 1.0)
HX 1200 (Set to Multi and Set to Single) Both had the same result (Smoke).
Crucial 8GB DDR4 2133

I only used the 24 Pin Cable and the 8 Pin CPU cable.
The fan is plugged into the CPU 4 fan connection.
The H100i was connected to the F_USB1.

One more thing I currently haven't tried this again but the board has and 8 pin and 4 pin CPU connector when I tried all connected it wouldn't boot but with just one 8 pin it did boot with the good PSU.

Any help would be greatly appreciated.
 
Solution
MasterWigu
I would say that you fried something in the VRM's, but in some way that it only makes a difference when using the two CPU power connectors. I am not sure if this can happen, but you can have fried some of the power phases or something like that that will cause problems when the cpu is under load. If the tests to the PSU came good the problem probably was caused by something else, like the surface on which you powered on the system or something like that.

The problem can be a defective motherboard too, but I don't know how to check or prove that.
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MasterWigu

MasterWigu

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Aug 19, 2016
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I would say that you fried something in the VRM's, but in some way that it only makes a difference when using the two CPU power connectors. I am not sure if this can happen, but you can have fried some of the power phases or something like that that will cause problems when the cpu is under load. If the tests to the PSU came good the problem probably was caused by something else, like the surface on which you powered on the system or something like that.

The problem can be a defective motherboard too, but I don't know how to check or prove that.
 
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