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| Short on 12V or 3.3V rail on Pascal (GTX 1000) GPUs Repair | |
|---|---|
| Device | GTX 1070, GTX 1070Ti, GTX 1080, GTX 1080Ti, GTX 1060 |
| Affects part(s) | Whole board |
| Needs equipment | multimeter, soldering iron, soldering station, thermal camera |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering |
Problem description
When the card is not turning on at all, causes the entire computer not to turn on. Caused by a shorted component on 12V or 3.3V rail.
Symptoms
- Sub 100 Ω on the 12V_Bus, 12V_EXT, or 3.3V_BUS.
- Computer won't power on or instantly shutting down upon pressing the power button.
- Fans not spinning (in case of blown fuse).
Solution
Diagnostic Steps
- Identify which rail is shorted by measuring the resistance of each. Pascal GPU Diagnosing Guide here you can find points to measure from
- Inject 1V 10A to the shorted rail
- Check with thermal camera or isopropyl alcohol for hotspots, all possible shorts are in the attached photos.
- In the case of 12V short, make sure to measure VCore voltage while injecting, if you read any voltage higher than 0.1V then a MOSFET is likely shorting 12V to the GPU then to GND.
- If this is the case, remove the ground power supply lead and connect it to VCore. Then identify the shorted MOSFET/Power Stage.
Repair Steps
- After the shorted component has been identified, remove it.
- If the short is still present, repeat the diagnostic steps until you find the other shorted component.
- If the short is gone after removing the component, replace it.
- In the case where the shorted component was a MOSFET and after replacing it shorts again immediately, replace the controller/driver for this MOSFET.