Laptop Model: HP Pavilion G4
Board Number : DA0R33MB6E0
Fault: Does Not Turn On
Repair Process:
After disassembling the machine sent by a colleague and measuring
the major inductors and common points, no short circuit was found. It dropped
to 0.001 after being plugged in and on standby.
The measurement did not show 3.3V or 5V in standby, and it was
found that the standby chip had been replaced.
Open the drawing and measure the data related to the standby chip: VIN:
19V (normal); VREG3: 3.3V (normal); VREG5: 4.9V (normal); so I concluded that
the standby chip is not broken.
The capacitors
next to the switch are prone to problems. After observing, I found that these
capacitors were corroded by water.
I thought it
would be better to remove them, so I removed them. After dismantling it,
it was found that the fault persisted and it still did not trigger. Continue to
measure the switch interface voltage.
+3VPCU: 3.3V is normal,
NBSWON1#: 0V is abnormal.
The connection between NBSWON1#
and EC and +3VPCU is abnormal. After measuring R442, we found that both ends of
R442 are 3.3V (normal), so we connected R442 to the 4th pin of the switch
(NBSWON1#).
After connecting, the current is triggered and runs all the way, and the
Laptop is successfully turned on.
After entering the system, everything is normal and the Repair is completed.
Happy Repairing !!
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