PSU tripping the MCB!!!

danishmishra

danishmishra

danishmishra

Associate
Joined
14 Nov 2011
Posts
9
Hey guys, I just asembled this PC about a fortnight back and have been trying to make it work ever since. The problem is that PSU keeps on dripping the MCB and cutting of the supply to the power socket. I thought something is wrong with the PSU, but I just heard from the Corsair people, it is fine! Since I am living in a university dorm, I can't really do much about the MCB.
Do you folks reckon a UPS would help?


16GB (4x4GB) Corsair Vengeance Jet
60GB OCZ Agility 3 SSD, 2.5" SATA 6
Sony BWU-500S-WW Blu-ray Writer x12
23" Asus PA238Q Pro Art LED Factory
Silverstone Raven ST-RV03B-WA Black
Intel Core i7 3930K Enthusiast Unlo
850W PSU, Corsair HX850
MSI X79A-GD65 (8D)
Thermaltake Frio Advanced
1280MB Asus GTX 570 DirectCU II

I am really frustrated with this problem! I appreciate any problem! :(
 
Have you tried a different socket on the ring main, it could be the MCB is weak and the power surge is coursing it trip.

Edit: Do you have any other equipment plugged in, i.e. heater.
 
I tried it in the kitchen socket where Microwave is plugged in! Microwave is rated for 1050W , and I don't think PSU is drawing more than 650W! A short circuit is happening somewhere, I jsut don't know where! Do you think position of RAM plays a part in this? I mean I got 8 dimms on the board and have put in the RAM module in 2 and 4 dimms! Do you think that might be affecting the whole scenario? And would a UPS help?
 
Reaper 392 said:
you havent done the classic mistake of forgetting the motherboard standoffs have you?
Click to expand...

Ouchh.. This will certainly cause a trip. Make sure also there are no screws loose or anything that's conducting with the chassis. Try also running a multimeter on the chassis when you power up. This will show any leaks to the case.

Try also a different power lead.
 
Nope, neither heater nor anything else is plugged in. Actually every dorm room got its own circuit breaker. Secondly I did use motherboard standoffs. Also I have tried using a different power lead and it did not make a difference.

Actually the pc starts up, but there is no signal through DVI cable and it says so on the monitor! And for ten seconds or so, lights are on on motherboard and graphic card. And then all of a sudden everything stops for two seconds, and again lights come on and fans start spinning. Cycle repeats itself for two times, and then MCB trips! Now this idea just hit me, do you guys there might be something wrong with the graphic card?

EDIT: I did measure the power draw, it is about 650W.
 
did you put the power connectors to the graphics card if they need them? it might be trying to draw too much power out of the motherboard and tripping?
 
Last edited:
Yes I did. There was another 4 pin ATX connector on the mother board for one of those times when you might want to put in some extra juice (eg SLI and overclock) I tested it with and without the connector plugged in, didn't make an iota of difference!
 
Have you totally discounted the PSU? it may be fine at Corsairs testing labs, or wherever they get tested, it may be one of those weird issues.

There's a youtube video from Corsair on how to yes the PSU with a paperclip and a case fan, might be worth trying that just to 100% discount the PSU being an issue.
 
Oh well I didn't see the youtube video. Well I sent it for RMA,and they just told me they haven't found any faults with it, so either I could get it back after paying 35 quids or get the refund for 10...so I went for later option. Now I need to order a new PSU and test it with that...preferably something in the 750W range...what do you guys suggest? In between it really sucks to have a pc sitting on your desk like a dead weight for more than a fortnight!!!

I would try to see if I can test my graphic card over the course of next two days.
 
Deception said:
Try building it outside the case, just to rule out case shorting it out.
Click to expand...

Already did. It still behaved in the same manner. I am of the opinion that there is a short circuit, and it is happening in or caused by the PSU.

About the in line MCB, how does one connect it? As in one connects it to the socket or somewhere else? I have never seen one before, let alone use it :confused:
 
danishmishra said:
About the in line MCB, how does one connect it? As in one connects it to the socket or somewhere else? I have never seen one before, let alone use it :confused:
Click to expand...

I meant RCD, I was getting mixed up.

Just google '13a RCD' and you'll find shops that sell them, they look like this:

R5LoQ.jpg
 
danishmishra said:
Yes I did. There was another 4 pin ATX connector on the mother board for one of those times when you might want to put in some extra juice (eg SLI and overclock) I tested it with and without the connector plugged in, didn't make an iota of difference!
Click to expand...

Huh? You're not talking about the CPU 12v are you? :S
 
James J said:
I did originally think that, yet I can't see one on the motherboards website using the zoom function

http://www.msi.com/product/mb/X79A-GD65--8D-.html

Theres an 8 pin (so both 4pin 12v cables) next to the CPU socket though as usual.
Click to expand...

Oddly there is a 4 pin molex, but it's underneath the last pci-e slot near the bottom edge of the board (edge furthers from the CPU socket)

Maybe they had to move it out of the way for all the extra gubbins on the x79?
 
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