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Quote from: Moordact on October 07, 2017, 03:47:55 PM

Anybody can help me out..

I have 5 12GPU rigs ,

1 of them i keep frying mobo's .. i have tried everything..

Tested all parts sperately all seems to work
however the minute i attach my PSU's to the motherwboard whilst I have GPU's and risers powered , even without plugging the PCI's in the MOBO.

It instantly fries my mobo...

I have fried 4 motherboards already trying to trial and error...

it used to work before though...

Why would you attach PSU's while the system is powered?
Maybe I'm not understanding something. Can you give more info?

You missunderstand or i explained wrong :d

Either either way..

I tested all parts separate by powering the parts with psu. All fans are running etc .

However if I prepare my system.
Combine all parts like they should.
The moment I power on. It will fry the mobo. The cpu fan will spin briefly and it is dead from this moment.

I have fried 4 mobos already cause i don't know how I can find problem without trying to connect it.

Is it possible a gpu is dead or something? It used to work before and suddenly it died after I had some gpu losses..

If it is this gpu or a extender how do I find it because If i have all gpu powered with psu no mobo and no display. Just power to see fans running all have working fans.

How is it possible that broken gpu fry my motherboards? Or is it something I'm missing

how are you switching on your other/s power supply ?
Using this ? https://www.amazon.com/Supply-Adapter-Connector-Triple-Multiple/dp/B073PRM7YZ
Manually ?
Something else ?

I would also not trust that PSU
if it's modular check the pins on the connectors that connect on the psu side - I had gpu's drop off tone particular cable regularly, it was driving me crazy until I noticed the disintegrating pin on the psu connector (it was a corsair 850i platinum)

Yes I use those.
However I have 4 systems still running like that.
Today I tested with a mobo with 6gpu card only.
It still fried, I also did not use the adapter for this test and it still fried my mobo.

I also tested

Also
I even fried a mobo while only the following where connected.

Connected on psu: hdd, pci extenders, 6pin gpu powers, mobo main plug +cpu.

Connected on mobo cpu + main mobo power.

The extenders were not plugged in.
This gives me reason to think it is not gpu?

Is it possible something gives short circuit? From psu?

it can be a lot of things but I would replace that psu. What brand and model is it?

on this particular system it are 2 different psu , on the other's it's 3 PSU all the same Cheesy

The malfunction system has a 1200 platinum seasonic psu and a corsair platinum 850 w psu

The othersystems all have 3 x 850w corsair platinum psu hxi or something

how do i sample test this psu to see for error?
can i use voltage meter?

If you fried so many mobos I wouldn't try connecting those power supplies anymore. Request RMA.

You can give it one more try before replacing the mobo and power supplies for that rig

What you should do is power the motherboard without any risers and GPU's first. Use only one power supply, plug the 24-pin ATX cable, 8-pin CPU cable and two 4-pin cables to the motherboard and power it on.

If it works, power down your PS, wait 30 seconds the plug one GPU directly to the pci-x16 slot (no riser), don't forget to plug PCI power to the GPU, then power on the rig.

If it works, turn off PS, wait 30 seconds, unplug the GPU and connect it trough riser to the motherboard on the x16 slot (plug power to the riser) then power on the rig.

If it works, power off the PS, add another GPU trough a riser, power on... and so on, keep adding one GPU at a time.

Here is manufacturer's web site explaining how to connect:
http://www.biostar.com.tw/app/en/event/crypto_mining/page4_2.htm

thx i will try again,