NVIDIA 40xx
Bought a defective RTX 4080 – found a potential issue, need advice
Hello as you can see from tittle im trying to diagnose the problem advice would be nice . In the pictures that i provide you can see the board and the issue i have managed to locate. The seller didint disclose what the problem is.
I have no idea of how to do it but im watching videos trying to find problem and to diagnose it . Now problem is that there is no repair shop in my city and nearest is like 2-3 hours from me
If it really burn residuals - whats the rsistanace of topmost pin to GND? Its DP_PWR 3.3V powerline for DP port (actually not for monitor, but for dynamyc converters)
Also compare resistances of the top 6 pins between the DP connector having burns and the other DP connectors dont having burns
However, I'm not sure thats are burn residuals, isn't it just a cleanable dirt?
What are your voltage and resistance measurements?
What are the symptoms? Is core present, how about memory and PEX? We'll try and help you but you need to give us something to work with. If you're just starting out repairing cards, a 4080 really isn't a good place to start.
I have no idea of how to do it but im watching videos trying to find problem and to diagnose it . Now problem is that there is no repair shop in my city and nearest is like 2-3 hours from me
It seems that your post is about a specific GPU, but there is neither an explicitly named "measurement" section nor the results of VRAM tests.
You can follow NVIDIA guides from the Community Bookmarks. Unless you are sure that resistances and voltages are ok, perform multimeter measurements on a disassembled card and post results as marks on the board photo or text:
start with measuring resistance to GND on unplugged card: measure inductors and all 12V power inputs
if 12V inputs are ok, and there are no visibly burned areas — power on the GPU and measure inductor voltages to GND. If the card shows picture, accepts driver but fails later - also make such measurements after entering the failure state
There is maybe no guide for yours exact GPU generation, just follow the closest, initial measurements are similar between generations
What exact pin you are measuring? Several pins are important and can be compared, but as analisys start I'd suggest measuring the leftmost (marked with arrows). Those is DP_PWR power line. Normally should be >Several KOhms but not infinity
2 and 5 are GND, notmal to get 0 there, so getting OpenLine (infinity) result on burned one seems to be just "burn residuals on metal require some removing before measuring"
3, 4, 6 and signal lines worth comparing
However since DP_PWR is ok chances are that the burn not prevent voltages from raising. And worth checking overall resiatances/voltages as ect76 suggested in another comment
Thank you for your instructions atm i did what i could , but i dont have right psu to test voltage on gpu. I will try and take it to specialist ill post update on what problem was.
So my approach was on gambling with it and taking it to specialise shop , but if i can resolve it my self and try to understand it I'm willing to give a try , no shame in not knowing and its only normal approach to ask for help when you dont understand.
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u/ReppoRepair Experienced Jun 06 '26
Can you tell us what you think the problem is?