New motherboard smokes when boot it up

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Damon Ma

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Nov 14, 2016
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Hi guys

I updated my old PC recently. Replaced motherboard(ASUS z170-a), memories and CPU (6700k, I didn't buy video card), but kept my old PSU, it's a CORSAIR vx550w. Since there's no video card, I thought 550w would be enough.

After I boot it up, It start smoking. I instantly unplugged the power cable. There's no obvious damage on the board.

The cables I connected:
8pin EATX 12V
24pin EATX Power
4 SATAs for SSD and other harddrivers
USB cable from box
Other cables from box ( power SW, HDD led, etc.)

The only difference between this new build and my old one is the EATX 12V. I used 4 pin for the old, 8 pin for the new one.

The smoking part:
6d6bdfd0jw1f9si0b2h6pj20rt1127ka.jpg
 
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Damon Ma

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Nov 14, 2016
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Already returned it. But I'm afraid I will get the same problem. Try to figure out how this happened.

Is it possible the USB cable from box would be the reason?
 
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JustEthan

JustEthan

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Nov 11, 2016
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I would just invest in a new psu. In my opinion anytime you are upgrading to a brand new system like that a brand new generation unless your psu is under a year old upgrade that too. especially after what just happened it's such a small price in contrast to what you just invested
 
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clutchc

clutchc

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Hard to say w/o knowing what that choke is for. And I'm not sure what you mean by "USB cable from box".
Might have just been a defective component on that particular motherboard.

When you get the new board, assemble the system in breadboard fashion; outside the case on an insulated surface. Connect just the CPU/cooler, RAM, PSU, keyboard, and monitor (to iGPU). Start the system by momentarily shorting the two pins that the power button would connect to.
Boot to BIOS and check that there is no problem thus far. Shut down using the PSU switch. Then add the drive(s), mouse, etc an item at a time until all the components are checked out. Occasionally touch that questionable component to see if it is getting hot. If all is well, you can assemble the system in the case.
 
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Damon Ma

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Nov 14, 2016
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Sorry, I mean USB cable from the case.

Thanks for the advice. I will try again when the new board back
 
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Damon Ma

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Nov 14, 2016
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I saw EATX 12V and EATX Power on board. Is this new standard for PSU? As far as I know, my old PSU is ATX
 
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clutchc

clutchc

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EATX is the later std. for using 4+4 pin (or 8 pin) connectors to power the CPU on the board. Prior to that std. it was just a 4-pin connection. The added wires allow for more current carrying capacity and less voltage drop for more demanding systems.
 
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JustEthan

JustEthan

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Nov 11, 2016
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If I'm not mistaken an old ATX psu would only have a 20 pin instead of a 24 for the board and probably justa 4 pin for cpu. It's just something that after an incident like that you can't be too careful. IMO. I actually just built a brand new rig about 3 weeks ago fried the cheao 130$ gigabyte mobo by plugging my h100i pump connector onto the mobowhile it was on. Thing sparked and shut off dead. Never had anything like that happen to me. Fried my pump too. So I took it back and paid the extra 170$ for the asus z170 deluxe with built in surge and reset and all that jazz. 89$ at best buy you can get a solid Corsair 750 watt semi modular psu. If you plan to never get a gpu get something smaller. It may have just been a promlem with that one mobo or somehting you overlooked but If you're upgrade is skipping 3 gen or more replace psu as well. IMO
 
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Damon Ma

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Nov 14, 2016
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Just got the replacement, and burned it again.
I built it outside the case first and everything worked fine, with these connected: 8pin atx 12v, 24 pin atx power, 4 hard drives(two are ssd)
Then I put it into case add another hard drive, one DVD rom and three fans for the case. Start it and smoke again at the same position as the picture I posted

Is it possible that case short it out, since the first mobo was also burned in it.

The stand offs looks pretty high. It's unlikely there is any contact between backplate and the case
I have 9 stand offs and 9 holes in mobo, they are all in the right places

I'm going to buy some washers for the screw.
Do I still need a new PSU?

6d6bdfd0jw1fa1wlvc6exj20qo0zkdng.jpg

6d6bdfd0jw1fa1wluzyozj20qo0zkjw8.jpg

 
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JustEthan

JustEthan

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Nov 11, 2016
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It sounds to me like you are most definitely shorting something out. That is a very scary situation. If you had zero problem outside of the case the first thing you need to do is only have the same stuff you had plugged in outside. If all you have done differently is add fans another hdd and an optical then man double and triple check your stand offs, make sure there is nothing else that can come in contact with the board back there. Check the wires on the fans and make sure there is no wear anywhere that is causing bare wire to contact metal idk man it sounds you've narrowed it down to just a few possible solutions. Is that a brand new case designed for a newer board?
 
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JustEthan

JustEthan

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Pull one of those stand offs out and touch it to the back of the mobo in fact maybe take them all out and attach them to the mobo and turn it on out of the case make sure when they are all screwed on that everything looks good make sure they arent too thick if thats even possible idk that's gotta feel pretty discouraging Do you have any pc friends that can come and look at it
 
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Damon Ma

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Nov 14, 2016
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It's a pretty old one, but with good quality. Antec P180, use it almost 10 years, not a cheap one at that time.
The third mobo is on the way, I'll double check as you suggested.
 
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Damon Ma

Commendable
Nov 14, 2016
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The stand offs are not detachable.
I will give it a try for the last time. Then I will change a new case and PSU
Thanks for all the replies dude
 
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JustEthan

JustEthan

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Nov 11, 2016
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Plz save yourself the heartache and time. It's seriously going to make me sick to my stomach if you wait another week or more and the same thing happens. I would imagine the standoffs are the same width but I'm not entirely sure. IDK if you had any cables or anything at all running under the board, it's weird that it worked outside. Something you are scerwing into that case is shorting out. It has to be. Something is shorting whether it be the psu in some form or another or a wire somewhere is exposed. IDK how many times they are going to exchange this for you but you can get a decent corsair, cooler master, or thermaltake case for 50$ and a solid psu for 70. One thing you'll notice about this sight is not too many people seem to care at all and I'm sorry for that. Wish someone else would chime in.
 
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