Re: LENOVO U330 DA0LZ5MB8D0 Quanta LZ5 REV



Understood... Thank you for all your help mcplslg123!...

Re: LENOVO U330 DA0LZ5MB8D0 Quanta LZ5 REV

I removed U20 and the short is gone. Problem is I don't know how to program IT8587. Is it a matter of having a donor chip or is it there a special software tool to program it?

Anyway I think I'm going to buy another motherboard.

Re: LENOVO U330 DA0LZ5MB8D0 Quanta LZ5 REV



Thanks mcplslg123
Yes.. Pin 3 (3.3V) is shorted. Removed PU6 and short persists ...

Hi there,
I have this laptop which is not powering on/charging with the AC adapter plugged in.

At some point, battery ran out and the laptop did not charge anymore and did not turn on either.

First things checked in the MB:
- Visual inspection. All clean.
- 19V on AC adapter -> OK.
- PD11, PF2, PQ20, PQ21 -> OK (fuse, diode, mosfets)
- C211 shows a short between GND and MX7 line to U20 (don’t know IT8587 internals, may be it is normal).
- PC65 shows a short between GND and 3.3V_ALW2
- Consumption 100mA @ 19V
...

Re: New Members - please post your introductions here

Hello,
I'm David from Spain. I have been an electronics/computers fan since I was a boy. Liked to dissasembly toys to see what they were made of. I usually try to do most of my own repairs taking some advance of my electronics background from my university years and all the valuable info posted in this and another forums. Thank you for letting me join.