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ROUBLE OF DC-DC CONVERTER
J1 PIN9,10,11
J1 PIN 2,3,4
U14 pin 5 6 7 8
U22,U15 pin2
CONFIDENTIAL
DO NOT COPY
–
Start
Yes
N0
U20 pin2
U17 pin2
U21 pin2
U19 pin2
U18 pi2
END
N0
The voltage is about
1. Check power board
2. Check power cable connection
The voltage is about + 12V while power switch on
1.
J1
connection good
2. Check
J1 Pin2,3,4
3. Check power board
The voltage is about +5V while power switch on
1.
J1
connection good
2. Check
U13
OPWRSB & OPCTRL2 Pin
The voltage is about +3.3V
The voltage is about +1.8V
The voltage is about +3.3V
The voltage is about +1.25V
The voltage is about +2.5V
The voltage is about +1.1V
5VSB
J1
transform +5V_TUNER
Page 9-5
File No. SG-0240
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