LA-C501P No ACDRV??

[dspok]

Re: LA-C501P No ACDRV??

From the voltage on pin # 20 (VCC), the charger IC @ PUB01 is not being powered.

See attached.

Review the parts that have been highlighted.

The dual diode and series resistor must be present and working to allow for the raw ~19v to reach this charger IC to power up this logic board.

On a normal logic board, pin #20 should be ~19 volts. Confirm it and update this thread.

Start with the voltage check on each pin of PDB1 (dual diode). Pin #1 should be about the same as the adapter voltage.

My bad, I attached wrong schematic. Board in NM-B731. I couldn't find schematic but boardview attached.

[mon2]

Re: LA-C501P No ACDRV??

See attached. It is the same flow. Check the voltages at each of the arrow points.

[dspok]

Re: LA-C501P No ACDRV??

See attached. It is the same flow. Check the voltages at each of the arrow points.

Pin28 has 19v. PD302 and PR314 is too.

[3mar]

i've fixed the same problem by replacing those component , the small capacitor was shorted and the small mosfet risistance was almost zero