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CONFIDENTIAL – DO NOT COPY
Page 10-5
File No. SG-0184
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TROUBLE OF DC-DC CONVERTER
Start
J1 PIN 9,10,11
J1 PIN 2,3,4,5
The voltage is about + 12V
while power switch on
1.J1 connection good
2.Check U9 GPIO Pin
3.Check power board
The voltage is about + 5V
1.Check power board
2.Check power cable
connection J1
U7
p
in 5 6 7 8
The voltage is about +5V
while power switch on
1.J1 connection good
2.
C
h
ec
k
U9
G
PI
O
Pin
U4
p
in2
The voltage is about +3.3V
1.J1 to connection good?
2.Check U4
U6
p
in 3
The voltage is about +9V
1.Check U9 GPIO Pin
2.Check U6
U5 pin2
The voltage is about +1.8V
1.Check J1 Connect
2.Check U5&L5
U14 pin2
The voltage is about +2.5V
while power switch on
1.Check U9 GPIO Pin
2.Check U14
END
U13 pin2
The voltage is about +1.25V
while power switch on
1.Check J1 Connect
2.Check U13