LG 43LJ55 -U Series Service Manual page 22

Standard Repair Process
Error
symptom
☞A17
Check Power LED
Logo LED
On?
. Stand-By: Red or Turn On
N
. Operating: Turn Off
Check Power cord
was inserted properly
Normal?
Y
Close
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Only for training and service purposes
B. Power error
Y
N
Check ST-BY 7.8V
☞A18
No power
DC Power on
by pressing Power Key
On Remote control
Measure voltage of each output of Power B/D
Y
Normal
Y
voltage?
Replace Power B/D
N
Replace Power
B/D
6
Established
date
Revised date
☞A18
N
Normal Check Power
On '"High"
operation?
Y
☞A18
Y
Normal
Replace Main B/D
voltage?
N
6/16
Replace
Y
OK?
Power
B/D
Replace Main B/D
LGE Internal Use Only