Free Microsoldering Forum – Ask an Expert
When is there a short? I put on 4 volts and 2 amps
I think that you should consider taking our online course first: https://www.microsoldering.com/product/microsoldering-the-full-curriculum-from-beginner-to-expert/
A normal booting phone should take anywhere from 0A to ~1A on the dc power supply. If it's taking 2A without even prompting to boot, then you have a main power line short. I'm not quite sure how to make that more clear.