Re: Lenovo Z50-70 ACLUA/ACLUB NM-A273 - Power circuit shorted

I have increased the current limit to 4A and noticed that PQ40 started to heat a little bit.
After desoldering PJ708 I was pretty sure that it must be one of the capacitors as pins 5,6,7,8 of PQ40 were shorted to GND.
One of them was a little bit scarred on the side, so I decided to remove it from board.
It turned out that PC100 was shorted.

Thank you for helping me

Re: Lenovo Z50-70 ACLUA/ACLUB NM-A273 - Power circuit shorted

Thank you very much for your reply and tips.
I did as you said.

It seems that whole blue line is shorted to GND.
I tried injecting volume at red arrow, but nothing gets hot at 3A. (Could I increase the current even further?).
Picture for reference (737_ACN leads to PU1208 which is not present in my revision of motherboard)

I have also inspected caps but none looks visibly damaged....

Hello

Laptop - Lenovo Z50-70
Motherboard: ACLUA/ACLUB NM-A273 Rev:1.0
Vendor: HannStar

I was doing some stuff on it utill I saw low battery notification. I have plugged AC adapter and immediately screen went blank. I thought that I was too late with plugging. However it stopped working after this. No LED.

I have checked the board for short circuits.
I noticed a malfunctioning mosfet - PQ302, so I have desoldered it. I checked its resistance, and it's really broken - R<1Ω
However, pins 5, 6, 7 and 8 are still shorted...

Re: New Members - please post your introductions here

Hello everyone, I have just joined because I was looking for my mainboard schematics.