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Dear all,

Laptop is Lenovo Thinkpad L480 (boardview can be found in this badcaps topic). When pressing the power button the LED power light turns on, but nothing else happens.

I removed the motherboard, checked for shorts on the main inductors. I found that there is a short to ground on the +3VALW_P rail (@PL201). I soldered a wire on the PL201 inductor, and I injected up to 1.3V with my power supply. Current drawn is approximately 3.2A.

I used a small thermal camera to locate the shorted component. But nothing on the board heats significantly, except the...

Lenovo 3000 G550A LA-5082P Laptop Schematic...

Lenovo 3000 Series Schematic

Lenovo 3000 was a line of low-priced notebook and desktop computers designed by Lenovo Group targeting small businesses and individuals. It was replaced with the IdeaCentre and IdeaPad brands.

3000 C100 laptop with Braille keyboard
Lenovo 3000 C
C100, C200 - 15-inch XGA screen
Lenovo 3000 N
N100, N200 - 14.1-inch- and 15.4-inch- WXGA models
N500 - 15.4 inch screen.
Lenovo 3000 V
V100, V200 - 12.1-inch WXGA models
Lenovo 3000 G
G400, G410, G430, G450, G455, G510, G530, G550, and G560...

Hi, thanks for helping.

The motherboard is from a gaming laptop, msi gf65 thin 10ue, 16W21/11S.

For starters, it doesn't power on. I measured a "short" on the second DC-IN mosfet, right around the charging port but I don't know how to find the component that's shorting it.

I already tried checking the mosfet for internal shortage (by desoldering and measuring) but no short. The drain on the motherboard is the one that's shorted, next to the gate (that's not shorted).
The photo below shows this better than words.

Thanks for anyone...