Question I plugged a PCI cable in to motherboard's 4-pin OC connector, then I saw smoke - - - what have I done ?

[PrvtCowboy]

Hi Guys,

all 3- 5 years i upgrade my pc myself.

i just bought asus x670 p Wifi with 7800x3d to ugrade my old intel.


It was late and i was stressed. i Found an "extra" 4 pin ( atx-12v-2) next to the normal one and connected a pci cable. Yes it fit perfect... -.-

After starting zero fans were running - but the pci cable smoked / melted fast and i cut off power. Atx / PCi plug burnt together a bit. Cbale 5 cm burnd together (only + / power)

Unplugged them, fixed burned cables and turned PCback on. PC is fast and running.


But if i want to do a restart, it wont work. Have to push power / force off when he is trying to restart after a while.

Armoury crate update not working. Bios update not working. Sometimes 1 long 3 short beeps (Gpu?)


Question: Did i break something? Or do i have seperate Problems? Customer Support / warranty is gone i think ;-)

Thank you guys! Sry for my english.

regards PrvtCowboy

pictures imgur

 

[Lutfij]

Welcome to the forums, newcomer!

What is the make and model of your PSU and it's age? You might want to also include images to show the extent of the damage as well as the cable you used in order to add to the connectors for your board.

 

[PrvtCowboy]

Hi, thank you!

Its an Corsair TX850W Model CMPSU-850TX, i think 2009.... And yes, the plastic is very old, i needed to fold very hard / 90 degrees, no space under aio. something broke? perhaps that was the main problem...?

 

[JohnBonhamsGhost]

Did i break something? Or do i have seperate Problems?

if there was smoke and melted cables, definitely!

continuing to use this PSU could cause some very heavy damage to the rest of connected components.

i would remove this thing asap and get another unit.

if i want to do a restart, it wont work. Have to push power / force off when he is trying to restart after a while.

Armoury crate update not working. Bios update not working. Sometimes 1 long 3 short beeps (Gpu?)

it's possible that motherboard and/or other components are already damaged.

2009....warranty is gone i think

15 years later, for sure.

 

[PrvtCowboy]

Hi,

as you said, Mobo etc could be damaged.
I ordered a new Mobo & PSU. Money saves my dumbness.

Thank you!

Main Question: How got the MoBo damaged? I just want to understand the technical site what happend.. Sure it got "wrong power".

i connected the atx 12v with the the 4 right pins from 6 pin PCie. Matched perfectly. Both are 12v?

There was too much power / heat? But does the atx need "more" power as the PCIe could give? How could "small" Pcie be too much and damage more then themselve?

In a german Forum i read the only bad thing that could happen is cable damage because of security off from PSU. Perhaps they talk about newer Psus ;-)

Sorry for my interest in things i dont really understand ;-)

Thank you for enlighten me!

 

[Gururu]

Hi,

as you said, Mobo etc could be damaged.
I ordered a new Mobo & PSU. Money saves my dumbness.

Thank you!

Main Question: How got the MoBo damaged? I just want to understand the technical site what happend.. Sure it got "wrong power".

i connected the atx 12v with the the 4 right pins from 6 pin PCie. Matched perfectly. Both are 12v?

There was too much power / heat? But does the atx need "more" power as the PCIe could give? How could "small" Pcie be too much and damage more then themselve?

In a german Forum i read the only bad thing that could happen is cable damage because of security off from PSU. Perhaps they talk about newer Psus ;-)

Sorry for my interest in things i dont really understand ;-)

Thank you for enlighten me!

If that is the case, it looks like you matched the +12v wires from the ATX cable to the ground connectors on the PCI cable. Meaning that you are running the live wire through the ground connector on the hardware. It looks like it may have shorted at the destination and super heated the wire enough to melt.

 

[CountMike]

Hi,

as you said, Mobo etc could be damaged.
I ordered a new Mobo & PSU. Money saves my dumbness.

Thank you!

Main Question: How got the MoBo damaged? I just want to understand the technical site what happend.. Sure it got "wrong power".

i connected the atx 12v with the the 4 right pins from 6 pin PCie. Matched perfectly. Both are 12v?

There was too much power / heat? But does the atx need "more" power as the PCIe could give? How could "small" Pcie be too much and damage more then themselve?

In a german Forum i read the only bad thing that could happen is cable damage because of security off from PSU. Perhaps they talk about newer Psus ;-)

Sorry for my interest in things i dont really understand ;-)

Thank you for enlighten me!

It was wrong polarity that's a killer for electronics working on DC current. Read and understand those darn manuals before you start anything. even after 40 odd years with PCs, I get and read manuals for all parts even before buying them as they show all quirks that my be encountered.

 

[SkyNetRising]

Main Question: How got the MoBo damaged? I just want to understand the technical site what happend.. Sure it got "wrong power".
i connected the atx 12v with the the 4 right pins from 6 pin PCie. Matched perfectly. Both are 12v?

Why would you do that?
If something fits, it doesn't necessary mean, it belongs there.

There was too much power / heat? But does the atx need "more" power as the PCIe could give? How could "small" Pcie be too much and damage more then themselve?

You inverted wires for +12V and ground and shorted them.
It's essentially the same as sticking both ends of the same wire into a power socket.

Edit: For any kids reading this - don't do that. It's stupid and dangerous.

 

[PrvtCowboy]

Edit: For any kids reading this - don't do that. It's stupid and dangerous.

Yes it is.

 

[USAFRet]

Does one of you think Mobo is fine / only Plastic / wires from PSU are damaged?

In a case like this, everything is suspect until proven working 100%.

 

[Gururu]

In a case like this, everything is suspect until proven working 100%.

Yes, if there is a problem it would be loud and clear. It's not like it would be slower or anything. Like wiring a house, sometimes you get lucky and everything works...

 

[PrvtCowboy]

Thank you guys - case closed for me 🙏