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Busted a VRM - Page 2

post #11 of 30
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post #12 of 30
id try replacing it, I have a dead P5K Deluxe here Ill ship you one of the FETs to replace it.

I think it prob could work if you didn't hurt anything else. Either it got too hot, or you tried to push it too far and the inductor exceeded saturation point and shorted.
    
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post #13 of 30
You have a QX6850 and over volt to 1.4v so I wouldn't be surprised if you fried a 3 phase VRM board over time. I fried a old Asus P5P800-SE (3 phase VRM board) in 3 months with a old Pentium 506 o/c to 4ghz with 1.525v (84w TDP default). It did not sparkle but one day I found out my computer was doing randomly reboot and I found out my board was brown under all the VRM area front and back... Instead of spending time fixing it, I would just look on ebay for a cheap replacement board with 6+ phase VRM.
    
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post #14 of 30
Thread Starter 
Quote:
Originally Posted by Sin0822;14676448 
id try replacing it, I have a dead P5K Deluxe here Ill ship you one of the FETs to replace it.

I think it prob could work if you didn't hurt anything else. Either it got too hot, or you tried to push it too far and the inductor exceeded saturation point and shorted.

I would appreciate that but I have no Idea how to solder, specialy a VRM on a motherboard.
Quote:
Originally Posted by marik123;14676600 
You have a QX6850 and over volt to 1.4v so I wouldn't be surprised if you fried a 3 phase VRM board over time. I fried a old Asus P5P800-SE (3 phase VRM board) in 3 months with a old Pentium 506 o/c to 4ghz with 1.525v (84w TDP default). It did not sparkle but one day I found out my computer was doing randomly reboot and I found out my board was brown under all the VRM area front and back... Instead of spending time fixing it, I would just look on ebay for a cheap replacement board with 6+ phase VRM.

1.4v is nothing for first generation C2D 65 nm dual and quad cores. Intel specifies the safe limit at 1.5. I know alot of people running them @ 1.6 or even higher. The motherboard is the weak link here, becuause those CPUs can take the punishment.
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post #15 of 30
it just a MOSFET, its not like you are doing a vmod lol. Well then if you don't want it you can throw it out, or try RMA.
    
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post #16 of 30
You can try to solder a new D2PAK power MOSFET on the top there and see what happens... I'd also replace the two surface-mount resistors and one cap to the bottom right and left of it. That inductor R68 looks weird to me. At least the silkscreen on the top of it...

Damage like that seems to have come from the 12V ATX power header. Looks like you used a PSU that couldn't deliver 12V at the needed amperage. Or there was a continuity issue at that plug or it was plugged in/out while it was running...

Also looks like Asus chinced out on the buffer/cap section on the 12V ATX in as you can see on the silkscreen and trace a spot for it. Typical Asus maneuver on a mid-range board... Prob not fixable as like one guy said it's burned through multi PCB layers frown.gif

PS check to see if the CPU works because it could have been nuked in the process
Edited by HiroPro - 8/22/11 at 10:11pm
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post #17 of 30
I would remove and resolder another just because its gone brown doesnt necessary mean its damaged iv had countless pcb with burnt out dc jacks on laptop but still work.Plus u havnt got anything to lose.gud luk
Edited by Fueled By Sapphire - 8/22/11 at 10:21pm
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post #18 of 30
When replacing the VRM, dont remove the leads from the board, clip it off and solder a new VRM to the old leads. same goes with caps, makes future service much easier.
post #19 of 30
for through hole yea don't remove it, but that MOSFET is in place of a driver IC, it just switches the two other MOSFETs on and off, i bet if you replaced it it would work.
    
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post #20 of 30
Quote:
Originally Posted by KingT;14673252 
With a motherboard w/ 3+1 Phase power design (old style VRM's w/o cooling) you should've been more careful..

If it was P5K Pro that would not had happen as it has 8Phas power design with cooling..

It could be repaired if you had a extra VRM from another mobo (which shouldn't be hard to find)..



CHEERS..

775 has no IMC

looks to me to be either 3 phase setup.

Really, it is probably just because it is old. Transistors can only last so long
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