[SOLVED] Motherboard smoked

[Positive_Beneficial]

Long and short of it, I built a new pc and motherboard started smoking when I turned it on. It was second hand and I'm trying to return it.

My main question is, if a buy a new motherboard could that also break? Could the fault be in the psu? The reason I kind of ruled this out is because when I plug in the 24pin connector by itself, the board turns on, but when I plug in the cpu 8 pin, the board sparks and smokes.

Does this mean the only motherboard is broken? Because the psu seems to be working fine. Could the case be that the psu itself caused the problem with the 8 pin, but the 24 pin works fine?

Edit1: Probably should post specs

MB: Asrock x570m
PSU: Corsair Rm 650x
CPU: R7 2700x
GPU: RX 580
Case: Corsair Crystal 280x

Edit 2: Just need to know if I put a new motherboard in and connect the psu to it, is there a chance it will blow?

 

[R_1]

Welcome to the forums 😀

in order asked
1 Could could always happen. there are no guarantees. I have built many systems with brand new parts and some parts were bad. we call this DOA Dead On Arrival.
2 it could indeed be the PSU but in order to know you need to test it under a load, AKA new board or another system. Have another system you could test the PSU in? the RMx is a great quality unit but PSU's age. how old is it?
3 could be, gotta test as I said.
4 if the motherboard was damaged from the get go, chances are great that replacing the weak link will fix the chain, so to speak. you are sure the cables are plugged into the RMX properly? you did not plug in the AUX power cable to the PCIE header (both 8-pin) on the PSU did you? They should be pinned different to prevent this but stuff happens and a double check of everything is never a bad call.

 

[Positive_Beneficial]

Welcome to the forums 😀

in order asked
1 Could could always happen. there are no guarantees. I have built many systems with brand new parts and some parts were bad. we call this DOA Dead On Arrival.
2 it could indeed be the PSU but in order to know you need to test it under a load, AKA new board or another system. Have another system you could test the PSU in? the RMx is a great quality unit but PSU's age. how old is it?
3 could be, gotta test as I said.
4 if the motherboard was damaged from the get go, chances are great that replacing the weak link will fix the chain, so to speak. you are sure the cables are plugged into the RMX properly? you did not plug in the AUX power cable to the PCIE header (both 8-pin) on the PSU did you? They should be pinned different to prevent this but stuff happens and a double check of everything is never a bad call.

Thanks for the warm welcome,

1. In my rush to write this, I neglected to mention that both the psu and the motherboard were second hand. That puts doubt into both.

2. I'm planning to call up some local pc stores to see if I can test the psu on some of their spares, as I said it's 2nd hand but what I really need to know is if its possible to have a faulty 8pin cpu output but a working 24 pin, because as mentioned, there were no sparks when I just plugged the 24 pin in.

3.

4. I assume that when you said "fixing the weak link" you meant just getting a new mb. I hope this is the case. I really don't have the money to buy new components, it would be really the highlight of 2020 for me to just have to throw it all away.

I'm going to go back and check that the 8 pin cpu is connected to the right slot and provide pictures for ease-of-mind. Thanks for the help.

 

[Positive_Beneficial]

https://imgur.com/a/s51qHTq

View: http://imgur.com/a/s51qHTq


The cable connected to the top 8 pins are cpu or atx 12v, it says cpu on the other end (probably should have posted a pic of that too, nvm) if anything looks off just let me know. This is how it was when it my motherboard blew.

So my question now is, can the psu still be at fault, providing power correctly for the 24 pin but maybe overloading the 8 pin for example? Even if its connected properly?

Thanks

 

[Positive_Beneficial]

Welcome to the forums 😀

in order asked
1 Could could always happen. there are no guarantees. I have built many systems with brand new parts and some parts were bad. we call this DOA Dead On Arrival.
2 it could indeed be the PSU but in order to know you need to test it under a load, AKA new board or another system. Have another system you could test the PSU in? the RMx is a great quality unit but PSU's age. how old is it?
3 could be, gotta test as I said.
4 if the motherboard was damaged from the get go, chances are great that replacing the weak link will fix the chain, so to speak. you are sure the cables are plugged into the RMX properly? you did not plug in the AUX power cable to the PCIE header (both 8-pin) on the PSU did you? They should be pinned different to prevent this but stuff happens and a double check of everything is never a bad call.

I just had another look. When it first failed I was using antec extension leads for the power cables. The braided ones. And I just found out that the layout for the cpu 8pin doesnt match the lead that I plugged it into. I didn't think this was the case initially because I tried the 8 pin with and without the extension lead, and it sparked and smoked every time.

1. What should I do should I carry on troubleshooting/testing the psu elsewhere?

2. Does this mean that if I plug the 8 pin directly with the new motherboard it will work fine?

Thanks. Forgive my 200 replies. Gosh I feel like a noob.

 

[R_1]

I just had another look. When it first failed I was using antec extension leads for the power cables. The braided ones. And I just found out that the layout for the cpu 8pin doesnt match the lead that I plugged it into. I didn't think this was the case initially because I tried the 8 pin with and without the extension lead, and it sparked and smoked every time.

1. What should I do should I carry on troubleshooting/testing the psu elsewhere?

2. Does this mean that if I plug the 8 pin directly with the new motherboard it will work fine?

Thanks. Forgive my 200 replies. Gosh I feel like a noob.

antec cables on a corsair PSU could have been the initial damage. the pinouts of the ports on the PSU change from maker to maker and are not compatible. As I am reading this it seems like the cable allowed too much voltage in the wrong place and caused the damage and smoke. with damage done, trying again with proper voltage would still reveal damage to the board.

 

[Positive_Beneficial]

antec cables on a corsair PSU could have been the initial damage. the pinouts of the ports on the PSU change from maker to maker and are not compatible. As I am reading this it seems like the cable allowed too much voltage in the wrong place and caused the damage and smoke. with damage done, trying again with proper voltage would still reveal damage to the board.

Makes sense. Just to clarify, they are coloured extension leads, kind of like cablemod, just for aethstetics, I was kind of led to believe that it's universal since they don't connect directly into the psu, they connect to the cables that come out of the psu. Anyway, it seems that the pin layout was incompatible, it's so annoying that the pentagon shaped pins fit in the square shaped cut out. My mistake.

So I'm guessing that's it? Could there have been two problems instead of one? I'm still going to try to see if I can test the psu on something else.