GH5JJ TLA-K701 no charging no power no acdet

[opethfan]

hi
i'm not skilled with laptop repair, i need some helps:

i don't have ACDET on PU1802 and in consequence i don't have ACDRV

please check pictures

[mon2]

Confirm the voltage on each of the 3 resistors on ACDET (highlighted in yellow).

Red meter probe on the resistor; black meter probe to ground. DC volts (20v or higher scale).

Report each measurement.

[opethfan]

[mon2]

Remove all power. Meter in resistance mode. Measure the resistance from pin #2 (where you measured 0V) to ground. What is the resistance in ohms?

[mon2]

Ok - see attached. This should explain your case with a solution.

Summary: Your ADAPDET pin on the power adapter is not supplying the ground (0V) to properly announce the ACDET voltage. See the explanation below and confirm each measurement.

To test, take a piece of wire and touch one side of the wire to ground. Other side of the wire to PQ101 pin #2 (be sure you review where pin #2 on this mosfet is located).

By shorting / pulling the gate voltage to GROUND (0V), PQ101 will turn OFF. Then you will have a valid voltage on ACDET.

[Sametbey]

Can you check these three points? You can compare the voltage values.

[opethfan]

Ok - see attached. This should explain your case with a solution.

Summary: Your ADAPDET pin on the power adapter is not supplying the ground (0V) to properly announce the ACDET voltage. See the explanation below and confirm each measurement.

To test, take a piece of wire and touch one side of the wire to ground. Other side of the wire to PQ101 pin #2 (be sure you review where pin #2 on this mosfet is located).

By shorting / pulling the gate voltage to GROUND (0V), PQ101 will turn OFF. Then you will have a valid voltage on ACDET.

ACDET now is 2.6v but still no power

[opethfan]

Can you check these three points? You can compare the voltage values.

I have only:

pin 28 - 19v
pin 6 - 2.5v
pin 24 - 5.9v
pin 25 - 5.9v

other pins are all 0 volts

[DeXXter]

ACDET now is 2.6v but still no power

Check REGN, the 6v ldo on the charger, if this is not present you have a faulty BQ, also check if it gets hot, this ic should be quite cold.

[opethfan]

Check REGN, the 6v ldo on the charger, if this is not present you have a faulty BQ, also check if it gets hot, this ic should be quite cold.

REGN 6V is present

the BQ is new, i changed for first some days ago

[Sametbey]

PJP101 power jack is important. BQ24780's 15 pin BatPres and REGEN are important. Measurements were taken with and without battery. Can you check?

[opethfan]

PJP101 power jack is important. BQ24780's 15 pin BatPres and REGEN are important. Measurements were taken with and without battery. Can you check?

I don't have the battery because this board is sent from another repair shop and he sent just the board