HP Pavilion ZD 8000 won't turn on

[desktop85]

Hello to everyone, I've an ZD800 that don't detect the charger, the 19v are present in the DC jack. I trace the problem to PQ89 double BJT and PQ25. I need the ACOK signal to turn on the PQ13 N-channel mosfet and then the voltage of gates of the mosfets (P-Channel) PQ15 and PQ16 drops down. I have VAD but not the VIN1.

Thanks to all that can help me to understand this part of the circuit, and sorry if my text have some errors I don't know english properly yet.

I attached the schematic. on the page 31 are the problem


Test that I made at the moment, replace the PU9 MAX1772EE battery charger controller

[Soldeer]

Re: HP Pavilion ZD 8000 won't turn on

First of all, thanks for the schematic! I noticed that the rev 2 version I had downloaded didn't exactly match my board, but your 2B version does!!!
I see your question is two month old without a reply. Did you manage to fix the board yet?

Did you check if ACIN (pin11 of the MAX) is > 2.1V? This is where it detects the 19V. When it does, ACOK (pin12) will go low, activating the ACOK circuit that turns on PQ15 & PQ16.

I have to reflow the GPU for the second time :-( because it has worked itself loose again. I figure I'll rig the GPU fan such that at least runs at a modest speed....

[desktop85]

Re: HP Pavilion ZD 8000 won't turn on

Hello and thank you for your reply, I still have the laptop, the client can wait to find a solution because she wants to use it. I'll check that and comment the results.

[ktmmotocross]

Re: HP Pavilion ZD 8000 won't turn on

when u jump second mosfet, laptop start?