HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

[ktmmotocross]

Hello.
Have this HP Elitebook 8740W that wont start with not original adapter. How to trick ADP_EN with aftermarket charger? i dont want to jumping signals. Anybody know if they used some ic for charger detecting like dell or some resistor to middle pin?

[ala_borbe]

Re: HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

100k resistor from dc+ to middle pin... easy mod to do on charger side

[ktmmotocross]

Re: HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

thanks mate. worked like a charm

[ktmmotocross]

Re: HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

any body know value of resistor for HP Charger for hp 15 laptops with blue connector end ?

[Vesko356]

Re: HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

any body know value of resistor for HP Charger for hp 15 laptops with blue connector end ?

Same story for HP blue connector with center pin (4.5x3.0)
You can use 330K resistor between DC+ and center pin=90W.

[ktmmotocross]

Re: HP Elitebook 8740W - How to trick ADP_EN with aftermarket charger?

thanks mate. i use 300K because i dont have 330K but it works anyway

[openminded]

useful list : https://www.parkytowers.me.uk/thin/hp/hp_psu.shtml