Hi everyone, I replaced this motherboard because it was important to get it working, but it's been with me for a very long time. Now I finally have time to figure out what the problem is,
I've never encountered something like this before;

No charging light, full dead

Lenovo Ideapad 330-17ICH

• PL3102: 5 ohms
• PL3001: 3.2 ohms
• PL3101: 2 ohms
• PL5801: 3.5 ohms
• PL5501: 270 ohms
• PL701: 35 ohms
• PL501: 146 ohms
• PL503: 390 ohms
• PL402: OL (0.27V) +5VALW_P
• PL301: OL
• PL401: OL (0.03V) +3VALW_P

+ Dc-in mosfet @PQ311 pin 5 20v, pin 1-4 0V , @PQ312 no volts...

Hi, I have dead t14 gen1 with nm-c931 motherboard.

Laptop doesn't turn on and does not show any sings of life.(battery is completely flat, do I need it for power on??)

When I connect usb c power adapter it draws 0.02A at 20v, I get voltage 20.5V up to 2nd mosfet and nothing out (PQ0006 before current resistor and buck-boost) when I touch gate pin of PQ0006 with tweezers it opens and I get 20.5v on current resistor;
But even with that "trick" I cant get laptop to turn on, that's probably because BQ25700ARSNR is not happy and not making VSYS15 rail.
...

Good day.
I'm trying to figure out what's wrong with a Lenovo Ideapad S130 motherboard. When I connect it to the bench PSU and limit the supply to ~2.2A (about the limit of the lenovo stock PSU), the board absorbs all the amperage and the voltage on the PSU drops down to about 4-5V.
The components on the board that get hot are the two mosfets ( 1 and 2 on the photo ) and the CPU. The resistance to ground measured on the power rail coils can be seen on the image (~17 and ~50 ohms). On the top of the CPU there are few caps which measure dead short. I checked all caps on the top side...

This machine has been in a few times with an intermittent fault of not charging. Motherboard is NM-A921 (https://www.badcaps.net/filedata/fetch?id=2051581)

So back again now, not working at all. Previously the adaptor had been replaced along with the DC charge port. This is one of these trapezoid shaped orange USB ports that Lenovo were using prior to going USB-C. It has 4 pins, but the DC connector jack on the PCB has 5 pins.

Fault presentation was the adaptor is only producing 5.2V, not 20V and this isn't reaching the input of the NVDC charger (PQ5/PQ6). There are 5...

hy, i have a PC M70Q - 11E8, that is dead, no power led, no logo led , change the CPU, still dead !
- pc is like new but with OS amazon.Gringotts2, i try to program bios 16mb, nothing, i change the 16mb W25Q128 with other, write another dump file, still no power up, replace again W25Q128 with other and write another dump file, still DEAD
- i have 3v3, 5v, 1v and others voltage. power botton drops to 0 and back 3v3.


my question , is possbile this pc will not power up becouse is locked ? maybe need a lan wake up , i dont know.​