#1 Hp 15-dw1071nl no power on (Main FPW50 LA-H323P Rev 1.0 )
przez robgerr • 13 listopada 2021, 14:05
Good morning friends of the forum. This laptop has the following problem. By connecting the power supply, the dc connector turns on, the absorption is 90mAmp and immediately drops to 10mAmp. When the power is on, the absorption rises to 40mAmp and the power LED lights up but after about 5 seconds the power on LED turns off, the absorption remains at 40mAmp for 10 sec. I noticed some oxide on PU301, cleaned and resoldered but same problem. I tried to reprogram the bios and the kbc (ENE KB9022Q) but same defect. I can't find the schematic.
Here are the voltages I found in the coils ( no battery connected):
Voltage without press power button:
all coil 0v except PL81 have 2,97V
After press power button:
PL1001 1,08v but after 10 sec drop to 0V
PL301 5V but after 10 sec drop to 0V
PL 302 3,3V but after 10 sec drop to 0V
Pl81 2,98V
Other Coil 0V

PU301 cleaned and resoldered
Here are the voltages I found in the coils ( no battery connected):
Voltage without press power button:
all coil 0v except PL81 have 2,97V
After press power button:
PL1001 1,08v but after 10 sec drop to 0V
PL301 5V but after 10 sec drop to 0V
PL 302 3,3V but after 10 sec drop to 0V
Pl81 2,98V
Other Coil 0V

PU301 cleaned and resoldered