With the right safety precautions, you can use isopropyl alcohol instead of freeze spray. You put a little bit of it on the board in the area you suspect lies, and look for it evaporating. Edit: You can also use a thermal camera, if you have one.Hm, I was trying to introduce 1.5V and the current went up to 1A. I let it warm up for a few minutes, but nothing, I didn’t feel anything warm.
Maybe I should try to use freezer spray? Although it is quite expensive.