Power Error - LG 55UM7450PVA Service Manual

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