DELL E7440 LA-9591P doesn't detect charger

[Conste]

Dear all,

I have a DELL E7440 which does not detect charger ID.

1. I have tried different chargers which work fine on my E7450 and are correctly detected.

2. Also tried different batteries.

3. I tried charging using the power dock in the office, which also won't make the unit detect the charger.

4. EC and MAIN were flashed with good known dumps from badcaps

What to do next?

Manual can be found here:

https://cdn.badcaps-static.com/pdfs/...2fcb0f0446.pdf

Could it be PU111? (page 41 should be the circuit).

Thanks in advance.

[Techtiger]

Re: DELL E7440 LA-9591P doesn't detect charger

voltage on PQ2 all pins Yep ma be PU111 volatge on all pin PU111 ?

[Conste]

Re: DELL E7440 LA-9591P doesn't detect charger

Voltage on Pin 1 and 3 of PQ2 is 0,33 volts, so not enough. Should be 3,3 I guess?
One Pin on PU111 is burned and gone, guess I have to replace this one first?

Or shall I desolder PU111 and see if it goes up to 3,3 volts?

[Techtiger]

Re: DELL E7440 LA-9591P doesn't detect charger

Voltage on Pin 1 and 3 of PQ2 is 0,33 volts, so not enough. Should be 3,3 I guess?
One Pin on PU111 is burned and gone, guess I have to replace this one first?

Or shall I desolder PU111 and see if it goes up to 3,3 volts?

desolder PU111 & see

[qayyum786]

Re: DELL E7440 LA-9591P doesn't detect charger

1} Replace "PR9" 33 ohms resistor ( most common cause)

2} After That Replace PU111

3} If you dont have PU111 Than
remove "PU111" and bypass by jumper from pin 3 to 4

Hopefully one of this solve the issue

[Conste]

Re: DELL E7440 LA-9591P doesn't detect charger

1} Replace "PR9" 33 ohms resistor ( most common cause)

2} After That Replace PU111

3} If you dont have PU111 Than
remove "PU111" and bypass by jumper from pin 3 to 4

Hopefully one of this solve the issue

After desoldering PU111 I had 3,3 volts. Then I put a small wire between Pin 3 & 4.
Battery is charging, adapter is correctly detected.

Thank you techtiger and qayyum786

[godit3]

Re: DELL E7440 LA-9591P doesn't detect charger

1} Replace "PR9" 33 ohms resistor ( most common cause)

2} After That Replace PU111

3} If you dont have PU111 Than
remove "PU111" and bypass by jumper from pin 3 to 4

Hopefully one of this solve the issue

i strongly believe u will be the next Bill gates....wow it worked like magic

[Adebeebs]

Re: DELL E7440 LA-9591P doesn't detect charger

1} Replace "PR9" 33 ohms resistor ( most common cause)

2} After That Replace PU111

3} If you dont have PU111 Than
remove "PU111" and bypass by jumper from pin 3 to 4

Hopefully one of this solve the issue

Thank you so much
This solve my problem