HP16 DAG3MMB3AAO REV A No power on, no led charger

[mon2]

Remove all power. Measure the resistance from pin #4 (ACDRV) on the charger IC to the gate pins on each of the DCin mosfets (PQ8200, PQ8201, PQ8202). This should be ~4k ohms.

Measure the resistance across the DCin mosfets (PQ8200 PQ8201 - they are in parallel so only one needs to be checked:

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8) ; use resistance mode checking not diode mode for these tests

Then repeat for PQ8202.

Post each measurement.

[judamex]

Remove all power. Measure the resistance from pin #4 (ACDRV) on the charger IC to the gate pins on each of the DCin mosfets (PQ8200, PQ8201, PQ8202). This should be ~4k ohms.

Measure the resistance across the DCin mosfets (PQ8200 PQ8201 - they are in parallel so only one needs to be checked:

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8) ; use resistance mode checking not diode mode for these tests

Then repeat for PQ8202.

Post each measurement.

For some reason, when I touched pin 4 of the PQ8202 MOSFET, it gave me pin 1, 2, and 3 readings for the PQ8200 and PQ8201 MOSFETs. When I removed it and applied power to the board, ACDRV magically appeared. The MOSFET on the outside gave me good readings. But just in case, I replaced it with an identical AONR32314, and everything works perfectly now.

I really appreciate your help, and with that, I'll close this post.