I recently got this laptop on a trade labeled for parts, when first testing it, the motherboard starts on, the power LED stays on while the gpu and cpu fans ramp up in different speeds, then it turns off after half a minute or so.
No flashes from the LED daughterboard that indicates battery and HDD, but the battery seems perfect and even charges if plugged (with it's LED on accordingly).
BIOS and EC were reflashed, did a clean ME already, no change in symptom but then i noticed 3 things while looking through the board:
PU5 (NB671LGQ-Z) was burnt in one of the pins, i swapped it out for an non-L variant of it which was the one i could get because of availability, that didn't change the symptom.
The BIOS chip does not receive 3.3v on it's VCC line, it instead gets 1.8v to 1.9v while the board is on (but without an schematic i can't really know if that is normal)
All parts of the board except for the initial power lines after the power jack doesn't heat up in any of the tests (but i didn't measure if CPU or even chipset get any power, doesn't seem like it since they do not heat up)
No flashes from the LED daughterboard that indicates battery and HDD, but the battery seems perfect and even charges if plugged (with it's LED on accordingly).
BIOS and EC were reflashed, did a clean ME already, no change in symptom but then i noticed 3 things while looking through the board:
PU5 (NB671LGQ-Z) was burnt in one of the pins, i swapped it out for an non-L variant of it which was the one i could get because of availability, that didn't change the symptom.
The BIOS chip does not receive 3.3v on it's VCC line, it instead gets 1.8v to 1.9v while the board is on (but without an schematic i can't really know if that is normal)
All parts of the board except for the initial power lines after the power jack doesn't heat up in any of the tests (but i didn't measure if CPU or even chipset get any power, doesn't seem like it since they do not heat up)