Vizio L37 Service Manual page 124

TROUBLE OF DC-DC CONVERTER
CONFIDENTIAL – DO NOT COPY
Start
J1 PIN 9,10,11
Yes
J1 PIN 2,3,4,5
Yes
U7 pin 5 6 7 8
Yes
U4 pin2
Yes
U6 pin 3
Yes
U14 pin2
Yes
U5 pin2
U13 pin2
END
The voltage is about + 5V
1.Check power board
N0
2.Check power cable connection
J1
N0
The voltage is about + 12V while
power switch on
1.J1 connection good
2.Check U9 GPIO Pin
3.Check power board
The voltage is about +5V while
N0
power switch on
1.J1 connection good
2. Check U9 GPIO Pin
N0
The voltage is about +3.3V
1.J1 to connection good?
2.Check U4
N0
The voltage is about +9V
1.Check U9 GPIO Pin
2.Check U6
N0
The voltage is about +2.5V while
power switch on
1.Check U9 GPIO Pin
2.Check U14
N0
The voltage is about +1.8V
1.Check J1 Connect
2.Check U5&L5
The voltage is about +1.25V
while power switch on
1.Check J1 Connect
2.Check U13
Page 10-5
File No. SG-0176