CONFIDENTIAL – DO NOT COPY
Page 9-5
File No. SG-0325
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TROUBLE
OF
DC-DC
CONVERTER
Start
J1 PIN10,11,12,13,14
The voltage is about + 5V(+5VSB)
1. Check power board
2. Check power cable, F10 & connection J1
3. Check Standby power
(+5VSB/+3V3SB/2V5VSB/1V8VSB/1V2VSB)
J1 PIN 1,2
The voltage is about + 12V while power switch on
1. Is J1 connection good
2. Check J1 Pin17 is up to about 3.3V ?
3. Check power board
4. Check F4
U1 pin 5 6 7 8
The voltage is about +5V while power switch on
1. Check F1 & U1
2. Check POWER_ON_5V (R7)
3. Check U1 pin5,6,7,8
U5,U7,U88,U89
The voltage is about +3.3V
1. Check F10 & U1
2. Check U5,U7,U88,U89 Power
U50
The voltage is about +1.2V while power switch on
1. CheckU50 pin1,2,3,4
2. Check U50 pin 5,6,7,8
U73,U94,U71
The voltage is about +2.5V while power switch on
1.Check J1 Connect
2.Check U73,U94,U71 Power
J6 pin1,2
The voltage is about 18V while power on
1. Check J6 pin1,2 (AUD_PWR)
End
