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MSI 990FXA-GD65 burned power connector?

post #1 of 2
Thread Starter 
Hello everybody,

I encountered a really annoying problem that neither I nor any of my friends know how to deal with.
Some time ago I bought a new MSI 990FXA-GD65 motherboard, along with an AMD FX 6300 CPU and Seasonic G-Series 650W PSU.

What I first noticed was that the mobo, apart from standard ATX 24-pin connector, had a new to me ATX 8-pin (labeled as JPWR2) (click for photo) and ATX 6-pin (labeled as PWRCONN1) connectors.
According to the manual (click for photo) the 8-pin power connector is supposed to provide +12V power to the CPU (that explains its position on the PCB - next to the socket).
It turned out the PSU came with a cable labeled "PSU" on one end, and "CPU" on the other (click for photo).
I wasn't sure if it was ok for graphics card and CPU to get power from identical sockets (click for photo) (considering PCI-E and "PSU - CPU" cables have different pinouts), so I checked if all the pins are the same shape, which they were, and connected the above mentioned "PSU - CPU" cable to the second socket from the left on the PSU.

According to Google and that (click for YouTube) video, using the 6-pin ATX power connector is not neccessary, unless I running multiple graphics cards, which I don't, therefore I did not bother with connecting it.

Unfortunately, after re-checking everything and hitting the power button, my setup ran for about one second and shut down. When I tried starting it up again I could scent the characteristic smell of burnt plastic, which was coming from the 8-pin ATX power connector...

I tried disconnecting the "PSU - CPU" cable and managed to get the CPU fan to start, of course without passing the POST phase.

I assumed there was something wrong with the mobo and returned it to RMA, where I got a new one as a replacement (they didn't mention what was wrong with the first one).
Then I carefully connected the PSU to the brand new replacement mobo, heard a very quiet hiss... and there comes the burnt 8-pin ATX connector again...

What am I doing wrong?

Thank you in advance for any help.
post #2 of 2
My best guess is that the wiring on the power supply is messed up from the factory, or that you have a grounding issue between the motherboard and the tray/case.

Unlikely that you got two motherboards that both have a problem with that same power socket.
wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
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wevs rig
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770K Gigabyte GA-Z77X-UD5H MSI GTX 670 PE OC x2 SLi Team xTreem 16Gb (2x4Gb) DDR3 2400Mhz 
Hard DriveHard DriveHard DriveHard Drive
Crucial C300 128Gb x2 RAID0  SK Hynix SH910 128Gb x2 RAID0 Western Digital Black Edition 1Tb Western Digital Black Edition 640Gb 
Optical DriveOptical DriveCoolingOS
Asus DVD / Bluray LG Bluray / Burner Custom H20 - Swiftech, XSPC Windows 7 Pro x64 
MonitorKeyboardPowerCase
Acer P243Waid Razer Black Widow Ultimate Corsair HX1000 Corsair C70 White Edition 
MouseMouse PadAudio
Razer DeathAdder SteelSeries Creative Soundblaster X-FI Titanium HD 
  hide details  
Reply
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