Short on 12V or 3.3V rail on Pascal (GTX 1000) GPUs Repair

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.

12V_Bus possible shorted components. (Figure 1)

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).

12V_EXT possible shorted components. (Figure 2)

3.3V_BUS possible shorted components. (Figure 3)

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.

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.