LG 55UB820T Service Manual page 58

Standard Repair Process
Error
LCD TV
symptom
☞A17
Check Power
Logo LED
LED On?
. Stand-By: Red or Turn On
N
. Operating: Turn Off
Check Power cord
was inserted properly
Normal?
Y
Close
B. Power error
No power
DC Power on
Y
by pressing Power Key
On Remote control
N
※
Check ST-BY 3.5V
☞A18
Established
Revised date
Normal
operation?
Y
Measure voltage of each output of Power B/D
Y
Normal
voltage?
Normal
Y
voltage?
N
Replace Power B/D
N
Replace Power
B/D
6
2013.01.31
date
☞A18
N
Check Power
OK?
On '"High"
Replace Main B/D
☞A18
Y
Replace Main B/D
6/16
Replace
Y
Power
B/D