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Name
VBUS0
8.8 U27 Output
Name
VCC_50
8.9 U25 Output
Name
VBATT
VSYS
9 Troubleshooting flow scheme
9.1
Can not power on
Y
Check short
Min
5
Min
5
Min
3.4
3.4
N
Is VBUS0 short
N
Check adapter
Check power key
Typ
5．1
Typ
5．1
Typ
--
--
Can not power on
Y
Is VBUS0 5V
Y
N
Is power key OK
Y
Is U
OK
Max
5.2
Max
5.2
Max
4.2
4.4
N
Is VSYS
V
Y
Check U
N
output OK
Check dry joint
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