HP ENVY K206NL mobo DAY11AMB6E0 Rev: E no power on

This laptop doesn’t turn on.
I got 3,3V but no 5V
Jack led is off
Fan doesn’t spin
CPU is hot
No short on PU12

Voltages PU12

1= 0,2V
2= 0V
3= 0V
4= 0,24V
5= 3,3V
6= 2,9V
7= 5,1V
8= 19,5V
10= 0,24V

Hello!

- Measure the resistances to ground on coils PL20, PL21 and on any pin of resistor PR211.
- Measure the voltages to ground on coils PL14, PL16, PL22.

PL20 rises up to 60K ohm
PL21 133 ohm

PR 211 start from 20M ohm and goes down slowly continuously (voltage 19,5V)

PL 22= 0V and 93 ohm
PL16= 0,81V
PL14= 0V and 48 ohm but raises up

valieromarco писал(а):PL21 133 ohm

This resistance is way too low.

valieromarco писал(а):CPU is hot

Is the small core of the APU hot?
If so, these two things points to a damaged PCH part of the APU hybrid.

Yes it’s the small core becomes hot

Ok resistance is low but I got 3,3V on PL 21
shouldn't it measure 0 volts?

valieromarco писал(а):shouldn't it measure 0 volts?

The enable signal on pin 1 of PU11 is present, so this chip is active and 3V is generated on the coil PL21, as it should be. But as mentioned, the resistance to ground on this coil is way too low, which is caused by a damaged APU, and therefore the small core of the APU is hot.

The APU is damaged, that's all.

Ok thank for all