No Power - MiTAC 8050QMA Service Manual

8.1 No Power-1

When the power button is pressed, nothing happens, no fan activity is heard and power indicator is not light up.
No Power
Is the
notebook connected
to power (either AC adaptor
or battery)?
Connect AC adaptor
Yes
or battery.
Try another known good
battery or AC adapter.
No
Power
OK?
Yes
Replace the faulty AC
adaptor or battery.
80 50QMA
80 50QMA
Board-level
Troubleshooting
No
power source problem
Replace
Motherboard
N/B Maintenance
N/B Maintenance
AC
Where from
Power
(first use AC to
power it)?
Battery
Check following parts and signals:
Main Board
Parts Signals Parts Signals
PJ701 Q37
ADINP +PWR_VDDIN
PL1 Q50
LEARNING +DVMAIN
PF1 U11
H8_I_LIMIT ADINP
PQ501
SW_VDD3 LEARNING
PD502
I_LIMIT
U513
U515
Check following parts and signals:
Parts: Signals:
PU3
BATT
PL507
BAT_T
PF501
BAT_V
PQ506
BAT_CLK
PD505
BAT_DATA
PL508
PD507
PQ503
105