I've already had a little help at r/GPUrepair to get me here. (kudos /u/khoavd83 ✊)
At this point I'm trying to figure out if the GPU is a dead duck or not, but I don't have a thermal camera to perform the proper test. I tried the iso alcohol evaporation technique but it was inconclusive. Anything else I can try?
The history of the card:
Bought second hand, cleaned it up. Tried to make a fan mod with some noctua A9x14's. Got the wiring right -- at first -- but had problems getting the fans to fire up. When probing the fan header for voltages, I shorted something in the header. Also relevant: at one point I swapped the PWM and Tach wires to see if I'd got them the wrong way around. (I know, I know).
Relevant resistances:
12V = 8.9kΩ
5V = 225kΩ
3.3V = 31kΩ
1.8V = 11Ω (uh oh)
MEM = 32Ω
PEX_VDD = 50Ω
GPU = 0.2Ω, GPU to 12V rail = 18kΩ
Story so far:
The header is a dual fan header with shared live and ground pins and two each of PWM and tach pins. Tach 1 shows only 60 ohms to ground (similar to the PEX rail). Tach 2 shows over 1k ohms. From reading resistances on other fan headers, it seems like the 60 ohms pin is the anomaly?
I already found two 0 ohm resistors that showed 150 ohms that connected the 12V rail to the 12V pin, which I've desoldered (replacements inbound), but I doubt they are the root cause.
At this point I'm trying to figure out if the GPU is a dead duck or not, but I don't have a thermal camera to perform the proper test. I tried the iso alcohol evaporation technique but it was inconclusive. Anything else I can try?
The history of the card:
Bought second hand, cleaned it up. Tried to make a fan mod with some noctua A9x14's. Got the wiring right -- at first -- but had problems getting the fans to fire up. When probing the fan header for voltages, I shorted something in the header. Also relevant: at one point I swapped the PWM and Tach wires to see if I'd got them the wrong way around. (I know, I know).
Relevant resistances:
12V = 8.9kΩ
5V = 225kΩ
3.3V = 31kΩ
1.8V = 11Ω (uh oh)
MEM = 32Ω
PEX_VDD = 50Ω
GPU = 0.2Ω, GPU to 12V rail = 18kΩ
Story so far:
The header is a dual fan header with shared live and ground pins and two each of PWM and tach pins. Tach 1 shows only 60 ohms to ground (similar to the PEX rail). Tach 2 shows over 1k ohms. From reading resistances on other fan headers, it seems like the 60 ohms pin is the anomaly?
I already found two 0 ohm resistors that showed 150 ohms that connected the 12V rail to the 12V pin, which I've desoldered (replacements inbound), but I doubt they are the root cause.
Comment