Alienware M17 R3 M/B LA-J521P charging issues

[ub6ib969]

yes pq12 is soldered on board. Measured using 2K ohm

source to drain = .0L
source to gate = .0L
gate to drain = .0L

[mon2]

Keep increasing the resistance scale till you have a measurement that is no 'OL' = over limit.

We need to know the resistance of the mosfets.

[ub6ib969]

moving counter clock each measurement.

2M ohm selected

source to drain = .0L
source to gate = 1.001
gate to drain = .0L

I got the same measurement at 20M (1.00)

[ub6ib969]

I was getting 3.2v at G4_DCIN now i get 0v and D4_DCIN 16.95V at PQ8. Then the area of pus801 gets very hot.

[mon2]

Remove all power. Meter in resistance mode (not diode mode). Measure the resistance to ground of PUS801 (LDO output). What is the resistance in ohms? If the meter reports 'OL' = over limit, then switch to a higher meter scale till you have a measurement. We are checking if there is a shorted part on this power rail which will cause PUS801 to be a higher temp than normal.

[ub6ib969]

2M OHM Measurement.

PUS801 PIN 1 +20_LDO_INPUT = 0.232

[ub6ib969]

do you think this could be pus05 ?
removed PQ12 and in diode mode measured source to gate = 0.549
resistance measurement at 2M ohm = 1.001

[ub6ib969]

found that psc812 is missing near pus801 however schematics displays @RF@ so was this removed? any help would be great thanks

PCS812 is reserved for rf request. No component.

[rogfanther]

Componentes marked with @ on the schematic are "Do not install". These came from the factory already not fitted in the board.

[ub6ib969]

thanks

figured that once I looked up other components with the @RF@ label.

[siddiq]

How did this repair go... were you successful?