MiTAC 8050QMA Service Manual page 111

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8.1 No Power-6
When the power button is pressed, nothing happens, no fan activity is heard and power indicator is not light up.
Discharge
Q49
+VDD3
SI2301DS
S
D
R378
100K
D20
BAS32L
R1
Q40
DDTC144TCA
12
KBC_PWRON_VDD3S
14
ADEN#
+VDD3_AVREF
P
23
U13
BAV70LT1
77
78
Keyboard
C332
C333
0.1µ
0.1µ
BIOS
W83L950D
2
BAT_CLK
3
BAT_DATA
80
50QMA
80
50QMA
+VDD3S
BATT
PC526
+VDD3
L81
1000P
120Z/100M
RP502
10K
ADEN#
PR509
226K
ADINP
PC617
1000P
RP4
D16
22*4
7
2
8
1
+VDD3
R385
R344
2.7K
2.7K
6
3
5
4
N/B Maintenance
N/B Maintenance
PQ506
PC527
AO4407
0.01µ
8
3
7
2
6
5
1
4
PR511
PQ507
33K
DTC144WCA
PQ504
2N7002
+VDD3_AVREF
PR510
499K
BAT_T
BAT_V
PC19
PR29
0.1µ
100K
PD2
BAV99
PR13
0
BAT_C
BAT_D
PR14
0
JO10
SPARKGAP-6
PD505
PR512
SCS140P
100K
A
K
PL504
120Z/100M
PL505
TR/SFT-10A
120Z/100M
PC523
PC514
0.01µ
0.01µ
PR134
4.99K
PR8
PC10
20K
0.1µ
+VDD3
+VDD3
1
1
PD3
BAV99
JP1
SPARKGAP-6
+DVMAIN
+PWR_VDDIN
J703
PF701
P
31
1,2
5
3
4
110

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