Re: Missing 12v in asrock z77 extreme 4
Just powered it to try to measure some 12v points and noticed the superio (NCT6776D) is shorted and getting the 3.3v regulator from 5v standby to become super hot as well. I think I need to order a new one cause that for sure is an issue. Thanks! If after replacing it I see no 12vin those points I am going to put the jump wire to that inductor and see what happens. I hope the superio doesn't fries again....
waldoalvarez00
Senior Member
Last Activity: 06-29-2021, 08:34 AM
Joined: 12-25-2015
Location: Santiago
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Re: Asrock X470D4U server board.
[url]https://cdn.badcaps-static.com/pdfs/9cd6f157670d45aa83ebbabaaba2dbb3.pdf[/url]
0x36 PEI_CPU_SMM_INIT
[url]https://en.wikipedia.org/wiki/System_Management_Mode[/url]
0x90DXE_BDS_STARTED (that means that is trying to boot)
I saw some ppl on another forums trying with video card and even one guy cooling with a fan the chip that reads aspeed.Re: Asrock X470D4U server board.<br ...I_CPU_SMM_INITLeave a comment:
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Re: Nvidia GTX960 start on second time
That kinds of things happen to me with some capacitor already failing. The power somehow fixes it temporarily and other power times it is "fixed" for a while. Then the thing comes back eventually.Leave a comment:
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Re: Asrock X470D4U server board.
I think you better find out what those codes in the led display mean. Should be in the board manual.Leave a comment:
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Re: Need help in identifying a component on a GPU
That fuse reads totally fine.Leave a comment:
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Re: Missing 12v in asrock z77 extreme 4
Another thing, I pulled some mosfets from VRM (3 of them) and they are totally ok as measured by transistor tester. So I soldered them back into the board and tested they where well connected with the meter. And another detail is that q958 and q951 that work together read 0 ohm from gate to drain. But they read good when pulled. They are controlled by this chip I add datasheet on the link [url]https://easyupload.io/ud0xio[/url]Re: Missing 12v in asrock z77 extrem...3 of them) andLast edited by waldoalvarez00; 06-26-2021, 09:03 AM.Leave a comment:
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Missing 12v in asrock z77 extreme 4
Hi Folks:
I have this board and attached a GPU that created a short in 12v pciex port lines (the slot). Something smoked with white smoke but nothing looks burned. Around the VRM was some smell. No idea if from GPU or motherboard. Nothing looks burned from GPU or motherboard. I do however have many points where there should be 12v and there is 374 ohm to 12v atx line. I post image with blue circles where there are 0 ohms. I was thinking to bridge with wire as pictured by green line since I find no other component that could be damaged and assume maybe a cooper line got damaged. Any...Last edited by waldoalvarez00; 06-26-2021, 08:54 AM. -
Re: Tesla m40 burned my motherboard VRM
I found this youtube video with a guy diagnosing something similar. Short in those pciex lines. (different shunt) Says looks repairable. I hope my GPU didn't fried.
According to what I understood there, one of the FETs feeds from the pciex slot and got shorted. According to the test he did in those small caps, my second DrMOS from top to bottom is shorted.
[url]https://www.youtube.com/watch?v=MunL4-DqFm8[/url]
So if I guess the safe move here would be to remove that FET and see if the short is gone....Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
Ok probably you are right about motherboard VRM since is 12v and shouldn't be going through motherboard VRM.
I do however tested 12v pcie pins looking at the pinout (first 3 side B)
[url]https://pinouts.ru/Slots/pci_express_pinout.shtml[/url]
to ground and they read like shorted. I don't know much about video cards but doesn't looks right to me.
I am thinking to test 3.3v lines too. Just guessing.
The FETs on the VRAM VRM don't read like shorted. They look ok and I saw no shorts...Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
I found the explanation from this guy.
[url]https://www.youtube.com/watch?v=6BBEasRiM_M[/url]
Seems the memory VRM failed somehow, that is why L14 inductor is cracked and close shunt is also little bit bulged. Since it takes power from PCIex port that is what caused the motherboard VRM to burn. If 12v didn't got to VRAM is repairable. Otherwise according to a guy comment in the video if 12v go into VRAM it even damages the GPU partially.
Conclusion this card is not safe to put in another motherboard...Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
I have update. I decided to remove heatsink and found something strange. One of the SMD inductors is cracked....Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
I had all pciex occupied when things happened. Video card (small one but without power input), wifi card and sound card + tesla.
I am wondering is it possible the card is only sucking power from pciex port rather than from the pciex power wires?
Maybe using all those cards caused the VRM to be overloaded? Maybe only when the driver turned on the card it started to consume big??
The worst I think is if the card turns on some circuit that is shorted or something when driver starts. Biggest concern to me....Last edited by waldoalvarez00; 05-31-2021, 07:42 PM.Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
This is exactly the power supply:
SSR-1200PD
Says
Protection OPP, OVP, UVP, OCP, OTP, SCP
We tested voltages with meters and all where in range, also powered another computer with it and all ok. No big load however. I have USB 40MHz Oscilloscope around. Will have to figure out how to safely add some load to it.
[url]https://seasonic.com/prime-platinum?__cf_chl_jschl_tk__=6d9062c47a46036a5a79ba16cab256564c8628dc-1622409443-0-AU_cR7cy2y6VzS8QKeXwEO4YiVA6w9_FvWmmE1ZfHmI2cr___9...Last edited by waldoalvarez00; 05-30-2021, 03:23 PM.Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
Power supply is a Seasonic Prime 1200 Platinum. The power connector was original NVIDIA CPU to PCIEX wire. I send you some pictures. I got an asus board now with DIGI VRM and DrMOS. I suppose that will avoid in the future burning my VRM again even with any overload. But still worried I could burn the new board once arrives. Previous board was running all perfectly with zero issues before. I gave to smell the Tesla card to some ppl and they say doens't smells like burnt....Leave a comment:
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Re: Tesla m40 burned my motherboard VRM
I forgot to mention the Tesla was quite hot when I removed it from the motherboard. I wasn't calculating anything. Just started driver installation.Leave a comment:
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Tesla m40 burned my motherboard VRM
Hi Folks:
I just bought an used Tesla m40 12 Gb used at ebay. Thing is I bought an nvidia CPU to pciex power adapter. Two wires to one. So I just plugged those two pciex and the card in pciex16 slot. It started all good. The computer booted, the linux driver installation program detected the m40. So I start to install the driver from the internet since the installation program told me it was on the linux channels. But then after a while (I was browsing the internet) my computer shot down and went into magic smoke. Thing is the VRMs burned. It has discrete mosfets (asrock z77 extreme... -
Re: Gigabyte GA-z68xp-ud3p no power
Looks like a small solid cap. I saw it was leaking down there. I already purchased some on ebay ultralow esr same capacity voltage rating. Let's see what happens cause this one is not an experiment is an expensive board.Leave a comment:
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Re: xbox 360 blowing mosfet
I should test those small SMD caps around the chip for shorts at least. Maybe some burned SMD resistor could shed some light without a scope. I have that transistor tester I modded a little bit adding some aligator clips that has ESR testing but don't think is too good. Fact is I have measured bulged electrolitic caps that have what looks good ESR (at least not altered compared to good ones) but they leak a lot (doesn't keep charge too well). I should check the QFN soldering as well. Looks good at least (visually I mean) but that format is quite problematic...Leave a comment:
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Re: Repairing a Dell H535T Motherboard
I have the ones you need but I don't have the ones I need. I always try to put the same capacity ones but think theoretically you can put higher capacity at the input of the VRM. At the output not really sure. I know main parameter of a buck converter is the inductor (choke) for ripple current as in here [url]http://www.daycounter.com/LabBook/BuckConverter/Buck-Converter-Equations.phtml[/url] now capacitors resist change in voltage. AFAIK if you put them higher resistance to voltage change should be higher. But then IDK if you are dealing with...Leave a comment:
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Re: Gigabyte GA-z68xp-ud3p no power
UPDATE: I managed to make it start. Sometimes it even boots sometimes it doesn't. I attached a dignostics card and sometimes it reports "bad signal check CPU block" sometimes I see the BIOS messages appearing in the dignostics card (I don't have a video card). I suppose it is the CPU VRM failing or something. Sometimes it goes back to not even power on. If I disconnect the 20+4 pins and attach a connector with a jumper that came this PSU with but leave the 12 V CPU lines connected the PSU starts. It is an EVGA 600 Watts PSU. This makes...Leave a comment:
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