Hi
Sony laptop brought, 3.3V line is short circuited. I used to toss voltage on short circuit so sorted part getting Hot. But now resistance between Voltage rail and ground is around 0~0.2 Ohm. when I toss 3.3V , Amperes goes to maximum(5.5A) and voltage drop to 0.8 volt like direct connect to ground!! no parts getting hot. I checked for metal part may cause this, MB is cleared, Anybody have any Idea how to find the burned part???

Need more powerful power supply. (more amper)