Trouble Od Dc-Dc Converter - Vizio VF550M Service Manual

TROUBLE OF DC-DC CONVERTER
J1 PIN10,11,12
J1PIN2,3,4/J5 PIN,1,2
U1 pin 5 6 7 8
U2,U3,U5,U45 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
N0
U6 pin2
Yes
N0
U10 pin7
Yes
END
The voltage is 5VSB
1. Check power board
2. Check power cable connection
The voltage is +12V, +24V while power switch on
1. J1 connection good; J5 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-0300