MiTAC 7521 N - Page 92

91
7521
7521
N/B MAINTENANCE
N/B MAINTENANCE
Symptom:
Symptom:
When the power button is pressed, nothing happens, no fan activi
When the power button is pressed, nothing happens, no fan activi
ty is heard and power indicator is not light up
ty is heard and power indicator is not light up
.
.
D/VMAIN
PF1
6.5A/32VDC
U12
H8
ADINP
PJ501
PC4
0.1U
PD502
RLZ24D
PD3
EC31QS04
PL4
120Z/100M
PR14
226K
PQ6
DTC144WK
2
3
1
PQ12
2N7002
G
D
S
3
12
D
SG
IN 5VTAP
SENSE OUT
F/B ERR-
SHUTDN GND
PWR_VDDIN
SW_VDD5
FROM H8
VDD5
S
G
D
SW_VDD5#
+5V
F5
R233
0
U32
LP2951-02BM
8
2
7
3
6
1
5
4
X
C235
4.7U
Q26
Q25
DTC144WK
3
2
1
D
SG
3
12
ADEN#_P
BATT
1
4
5
6
7
8
2
3
PJ4
6
PF1
6.5A/32VDC
PR2
301K
PC5
0.1U
50V
PR1
100K
PU8
SI4435DY
PR21
33K
PR20
100K
BAT_V
BATTERY IN
RP22
38
BAT_V
POWER IN
PL1
120Z/100M
D
S
G
LEARNING
PR10
1M
PQ5
2N7002
PR11
120K
G
4
6
7
8
2
3
S
D
1
5
PR12
470K
PR18
715K
PR17
100K
+
-
PC6
0.1U
PL1
120Z/100M
PL2
120Z/100M
PC1
0.01U
PC17
0.1U
PQ8
PR13
10K
PR15
100K
VDD5S_P
Q508
BATT_ALARM
7.1 NO POWER:
PU1
SI4835DY
PC3
0.1U
PR89
4.7K
PD1
EC31QS04
PD2
EC10QS041M
PD4
EC10QS041M
D/VMAIN
1.25V
PU2B
J514
CHARGE B’D
POWERBTN#
SW2
POWER BUTTON
R577
C577
R230
100K
J1
47