LG 55LA7400 - No Video; no Audio

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Normal
voltage?
Check various voltages
of Power Board
( 3.5V,12V,20V or
24V…)
No Video/
No audio
Check and
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date
2/13
LCD TV
Error
symptom
2012. 11 .30
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