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Faulty GTX1080 not outputting video

Associate
Joined
22 May 2021
Posts
2
Location
Coventry, UK
Hi, overclockers,

In these trying times of insanely high GPU prices I have turned to looking at faulty GPUs on eBay and attempting to see if they can be resurrected. I saw this MSI GTX1080 FE on auction coming from a seller who wasn't too tech savvy. They installed it on the second PCIe slot of their system and ran GPU-Z to see if it was being recognised. Indeed it was. However it was not giving any video output! I assumed the reason for this was that the drivers were not installed and that it was conflicting with the AMD card present on the first PCIe slot, so against my better judgment I bid on it, taking a huge gamble.

Fast forward 2 days later and the GPU arrives, looking in pristine condition. All cleaned, no bad capacitors, no signs of corrosion/liquid damage/physical stress. I plopped it in my system expecting to see a signal but after 1 minute... nothing. The only thing that was lit was the VGA LED on the motherboard, signaling a GPU fault. I reset my CMOS, put back my other GPU to set up settings in BIOS, all sorts of settings related to PCIe link management, but to no avail.

The GPU has a "Geforce GTX" logo on its side that lights up. When turning on the system, this lights up for a few seconds, and then it turns off precisely when the motherboard starts showing the VGA LED. In all this time, the fan of the GPU is spinning. It never turned off. The VGA LED stays on for a few minutes, indicating that maybe the motherboard doesn't even POST.

But after these few minutes, the PC continues to boot "normally" from SSD. Yet there is still no video output. It boots into Linux and I can connect remotely to it to see what is going on with the GPU. The GPU is correctly detected as a GTX1080, and I can even see every detail about it using "lspci" and "nvflash". Because the GPU was being detected but the drivers were failing to initialize it, I assumed that this was a vBIOS issue, so I grabbed an original MSI FE ROM and flashed the card. Still, after a reboot there was no video output.

Messages from the kernel log would output:
Code:
NVRM: RmInitAdapter failed
NVRM: rm_init_adapter(0) failed for device bearing minor number 0
which indicates that the driver can't talk with the GPU at all. Bad news!

I took the GPU apart and gave the graphics processor a very good clean, as the thermal paste was covering the capacitors surrounding the core. This also did nothing.

My system consists of a Ryzen 5 2600, 16GB of RAM as well as a MSI 5600XT running on a MSI B450 PRO-M2 motherboard. The PSU is a 600W EVGA bronze.

Are there any steps I could take to check what component on the GPU board is faulty? Would reflowing be worth it in this case?
 
Pretty guarantee no video output is not driver related. Its going to need heat. Best to steer clear of those faulty types unless you want to heat things up.
 
I saw this MSI GTX1080 FE on auction coming from a seller who wasn't too tech savvy.

Oh rest assured he's ebay savvy. They know exactly how to come across and what to say they restricted themselves to doing as part of troubleshooting to give potential buyers hope they will easily sort the issue out.
 
Thank you everyone for the tips. I tried all the video outputs available on the cards and flashing a different vBIOS, but these didn't help. I found this "confidential" diagnostics tool from nvidia called "MODS", and ran some tests to really see what's going on under the hood. The tool spit out the following:

Code:
NV_PMC_INTR_0 bit 30 high.
Trying to clear interrupt by writing 0x2 to register 0x12004c
Couldn't clear GPU's interrupt state; NV_PMC_INTR_0 == 0x40000000.
Error 000000000608 : Gpu.Initialize Interrupt request line stuck asserted
Error 000000000608 : Global.PrintGpuInitError Interrupt request line stuck asserted
Error 000000000608 : Global.InitializeGpuTests Interrupt request line stuck asserted
ERROR: Unable to determine current VGA mode, ax=0x4f03
ERROR: Unable to set VESA mode 0x3, ax=0x4f02
Error 000000000237 : Global.EnableUserInterface unable to set mode
PexDevMgr not initialized.  Bridge device shutdowns will likely do nothing.

Error Code = 000000000608 (Interrupt request line stuck asserted)

It seems to me that the master controller on the GPU isn't responding to any commands, so it's most likely a reflowing job then...
 
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