Vizio SV420M Service Manual page 24

TROUBLE OF DC-DC CONVERTER
J1 PIN10,11,12
J1 PIN 2,3,4
U1 pin 5 6 7 8
U2,U3,U5 pin2
CONFIDENTIAL DO NOT COPY
–
Start
Yes
N0
Yes
N0
Yes
N0
Yes
N0
Yes
N0
U9 pin2
Yes
N0
U7 pin2
Yes
N0
U4 pin2
Yes
N0
U6 pin2
Yes
N0
U10 pin7
END
The voltage is 5VSB
1. Check power board
2. Check power cable connection
The voltage is +12V while power switch on
1. J1 connection good
2. Check power board
The voltage is +5V while power switch on
1. Check U11 OPWRSB 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 +8V
The voltage is about +1.08V
J1
Page 9-5
File No. SG-0298