Connect gnd to ground.
Test probe on + if it beeps then solder a wire and connect
Dc power supply and inject 1v 050amps and increase.
Some shorts maybe with other parts on board but you can use this same method.
Use lighter petrol or freeze spray thermal camera works best
For power faults only
If the board is taking in voltage and no amps then use method above.
Sometimes if you are on 19v and 0.0 amps increase a little bit till you se 1amp and fan will kick in on dc power supply.
Share your methods