LG 42LV4400 Service Manual page 69

TROUBLE OF DC-DC CONVERTER
J4 PIN 8,9,10
–
CONFIDENTIAL DO NOT COPY
Start
Yes
J4 PIN1,2,3
Yes
Yes
CE15
Yes
CE10
Yes
CE16.
Yes
FB17
Yes
U8 pin2
Yes
U52 pin2
Yes
U10 pin3
END
The voltage is 5VSB
N0
1. Check power board
2. Check power cable connection J4
The voltage is +12V while power
N0 switch on
1. J4 connection good
2. Check power board
3.check J4 pin11 is ok
N0
The voltage is VCCK while power
switch on
1. Check U15 OPWRSB Pi
N0
The voltage is about +3.3V
N0
The voltage is about +3.3V
N0
The voltage is about +3.3V
N0
The voltage is about +1.25V
N0
The voltage is about +1.8V
N0
The voltage is about +5V
Page 9-5
File No. SG-0000034