HP Probook 4420s won't power up on charger

[sonunigam]

Re: HP Probook 4420s won't power up on charger

Dear Whaldsz,
I've checked PR6 = 220K and it is ok.
I've checked PR123 = 150K and it is also okay.
PR6 is not opened.
I've checked PQ9 and PQ11 it is also good on multimeter.
I've also changed KB1098NU.
I've also changed BQ24740
But not successful.
What should i do?

[saularciga]

Re: HP Probook 4420s won't power up on charger

Voltages in PQ9 and PQ11?? in mode power off
voltages in PU18?? in mode power off

Remove PQ3 and make an jumper in drain and source.
After of change KB1098NU and bq24740, laptop work ok but battery not?

[whaldsz]

Re: HP Probook 4420s won't power up on charger

Dear Whaldsz,
I've checked PR6 = 220K and it is ok.
I've checked PR123 = 150K and it is also okay.
PR6 is not opened.
I've checked PQ9 and PQ11 it is also good on multimeter.
I've also changed KB1098NU.
I've also changed BQ24740
But not successful.
What should i do?

1. what voltage do you get at pin 2 of PQ9 and PQ11?
2. If you don't get any voltage reading at pin 2 of PQ9 and PQ11, check the voltage at PL6.
3. If not voltage at PL6, check PR294. PR294 could be open or PC61 or PD12 could be shorted.

[samanthban]

Re: HP Probook 4420s won't power up on charger

Thanks this was helpful