HP Probook 640 G4 not detecting the dc adapter and will not charge the battery

[giagi]

I have a HP Probook 640 G4 laptop which does not detect the DC charger and therefore will not charge the battery. I checked the dc adapter on another working probook 640 and it functions adequately.
I checked the voltages coming in on the motherboard connector from the DC adapter to the bad unit and measured one voltage to be 19vdc and the other the center pin to be about 0.8vdc. I tested the battery and it was found to be OK.
I am not sure what the center pin voltage should be. I suspect the problem to be a component on the dc input line on the motherboard but I do not have any schematics and I am not sure where to look. Can someone please help, I would greatly appreciate it

Thx
Nick

[mon2]

What is the history of this non-working unit?

Any liquid damage?

is the other working unit examined the same model as the non-working laptop?

if you remove the battery and attach only the power adapter, does the laptop power up and boot normally?

[Stevedb]

First check dcin imosfets for internal short.

Regards

[giagi]

As far as I know no water damage. The unit boots normally with or without the battery. The other unit is the exact same model. The only difference is that the good working one detects the ac adapter and the bad one does not.
I cannot check dcin because I do not have schematics. can anyone provide a link to schematics. thanks for responding

[Stevedb]

Hi you got dcin charger then it will go to first and second mosfet you do not need shematics for this provide hd pictures . But check those mosfet between S-G , D-G , S-D IN OHMS MODE BEST 200 OHMS OR IF YOUR AUTORANGE DMM.

[giagi]

Steveb I have attached a few photos of the motherboard for you to look at

[Stevedb]

Check d60200 and D6035 and check u6035 looks like a burned pin what is written on the ic.

Regards

[giagi]

thanks a bunch stevedb