LG 55UM7450PVA Service Manual page 36

Standard Repair Process
Error
symptom
Check outlet
Check A/C cord
Check for all 3- phase
power out
Fix A/C cord & Outlet
and check each 3
phase out
B. Power error
Off when on, off while viewing, power auto on/off
N
CPU
Error?
Abnormal
Y
Abnormal
1
Established
date
Revised date
Normal?
Replace Main B/D
N
Replace Power B/D
7
Y
End
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