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TROUBLE OF DC-DC CONVERTER
CONFIDENTIAL
DO NOT COPY
–
Start
J9 PIN10,11
Yes
J9 PIN 2
Yes
U1 pin 5 6 7 8
Yes
U2 & U33 pin2
Yes
U6 pin 2
Yes
U5 pin2
Yes
U10 pin2
U3 pin1 & pin2
END
N0
The voltage is about + 5V
1. Check power board
2. Check power cable, F3 & connection J9
3. Check U8 pin1 (+5V) & pin2 (+3.3V)
N0
The voltage is about + 12V while power switch on
1. Is J9 connection good
2. Check J9 Pin1 is up to about 5V?
3. Check power board
4. Check F1.
N0
The voltage is about +5V while power switch on
1. Check F2 & U1
2. Check OPWRSB (R20)
3. Check U1 pin1&2 or pin 3&4, should have -1V more.
N0
The voltage is about +3.3V
1. Check F2 & U1
2. Check U2 & U33
N0
The voltage is about +1.6V
1. Check F2 & U1
2. Check U6
N0
The voltage is about +1.2V while power switch on
1. Check F2 & U1
2. Check U5
N0
The voltage is about +2.6V while power switch on
1.Check J9 Connect
2.Check U10
The voltage is about +12V to +5V(for Tuner)while power
switch on
1. Check F1
2. Check U3 pin1 (+12V) & U3 pin2 (+5V)
Page 9-5
File No. SG-0221
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