LG 28LJ400B Service Manual page 30

Standard Repair Process
9 Power Supply Trouble 2
Go to
check
Main
board
function
A6 Power supply Trouble 2
No power
Non output, IR indicator light slake
Y
Check if 12V 19V 24V/
32V/50V
Check if FB 1 Open
Check EMI open or L N short
Check if EB1 voltage
N
about
Check if UB101 PIN5
voltage is about 15V
Check the rectifier
Check if output short
output normal
N
Check the power
Y
components
damage or not
N
Y Change short
components
N
2Vac
Y
Check if RB100,
N
RB101,RB102
open
Y
N
Change
UB101
6 12 31
Y
Change damaged
components
Y
Change damage
resistors
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