Service manual

CONFIDENTIAL – DO NOT COPY
Page 9-5
File No. SG-0208
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TROUBLE
OF DC-DC CONVERTER
Start
J7 PIN10,11,12
J7 PIN 2,3,4
The voltage is about + 12V while
power switch on
1.J7 connection good
2.Check J7 Pin1 is up to 3V?
3.Check power board
The voltage is about + 5V
1.Check power board
2.Check power cable
connection J7
U1 pin 5 6 7 8
The voltage is about +5V while
power switch on
1. Check U11 GPIO_7 Pin
U4 pin2
The voltage is about +3.3V
1.Check U4
U6 pin 2
The voltage is about +3.3V
1.Check U6
U8 pin2
The voltage is about +3.3V
while power switch on
1.Check U8
U5 pin2
The voltage is about +1.8V while
power switch on
1.Check U5
END
U7&U8&U10 pin2
The voltage is about +1.8V
while power switch on
1.Check U7&U8&U10