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Flow Chart of Troubleshooting and Circuit Diagrams
5-2
ON/OF
F
1
VI
N
V
OUT
5
One Point Contact
PCB FIXING HOLES(1.9)
LP2981AIM5X-3.3
U621
GND
2
NC
4
3
1
VIN
VOUT
5
C535
10UF/6.3V
U470
LP2981AIM5X-3.0
GND
2
NC
4
3
ON/OF
F
H401
H402
H403
H400
R738
1K
C587
10N
F
1K
100N
F
C751
R1,C
1
R
2
1
S2
4
R584
U474
SI3865D
V
D2
2
D2
3
ON/OF
F
5
6
C749
1U
F
1U
F
C318
5
VOUT
1U
F
C748
U620
LP2981AIM5X-3.
0
GND
2
NC
4
3
ON/OF
F
VI
N
1
MCL4154
D441
AVCC
C436
10N
F
C536
100U
F
10N
F
C427
100N
F
10N
F
C319
VDD3.0
C326
C305
100P
F
C307
10N
F
RB414
BAT
1
C750
10UF/6.3V
R583
100K
10UF/6.3V
C328
C306
10UF/6.3V
U619
2
GND
NC
4
3
ON/OF
F
1
VIN
VOUT
5
C579
100U
F
LP2981AIMX-2.5
C555
+VBAT
T
RTC_VCC
LVCC
27P
F
RTC_3V
3
+VBAT
T
POWE
R
VOUT