LG 32LH500D - Power error - Off when on, off while viewing, power auto on;off

Standard Repair Process
Check Power B/D
voltage
N
Error
Y
Normal
Y
Voltage
N
LED TV
Error
symptom
Power error
Established
date
2016.03.07
Off when on, off while viewing, power auto on/off
Revised date
7/12
A7
Fix A/C cord & Outlet
Replace Power B/D
Replace Main B/D
check power on
"high",normal it is
about 3.3V
Check outlet
Check A/C cord