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