Hp 250 ABQ52 LA-C811P

[arber1232]

Hi everyone i have laptop Hp 250 turn on and off after 5 seconds . i measure the first mosfet voltage is ok no problem . 3.3v is ok . In power supply current is low goin in 0,030 amp . Have can i do can i help me ?

This is shcematic

[mon2]

Re: Hp 250 ABQ52 LA-C811P

Hi.

1) are you using the official and known good power adapter?

2) what is the voltage to ground of ADP_ID ? This is a voltage supplied by the power adapter that the logic board will read and this will define if the power adapter is capable of powering the logic board.

3) do you see any graphics when the power is on?

4) what is the history of the unit? Any liquid damage?

[arber1232]

Re: Hp 250 ABQ52 LA-C811P

Hi.

1) are you using the official and known good power adapter?

2) what is the voltage to ground of ADP_ID ? This is a voltage supplied by the power adapter that the logic board will read and this will define if the power adapter is capable of powering the logic board.

3) do you see any graphics when the power is on?

4) what is the history of the unit? Any liquid damage?

yes im using original adapter voltage in ADP_ID is 18,5volt ..
No i can see anything whrn i put power button laptop turn light of power for 5 second and turn off . no laptop not have liquid damage laptop looking good.
I connect laptop with my power supply i see current not change when i turn on laptop .

[mon2]

Re: Hp 250 ABQ52 LA-C811P

yes im using original adapter voltage in ADP_ID is 18,5volt ..

Can you confirm this measurement?

If correct, this has very likely caused damage to the EC (KB9022QD = the IC that measures this voltage). The ADP_ID voltage should never be this high as the zener diode is there to limit the peak voltage to a safe value.

The ADP_ID is fed into an analog to digital converter to gauge if the adapter is suitable to power the logic board.

Respectively, the EC cannot accept such a high voltage directly onto its input pins.

[arber1232]

Re: Hp 250 ABQ52 LA-C811P

sorry, I misunderstood ADP_ID IS 0.752V