LG LAEC015 Service Manual page 31

Standard Repair Process
AIO136
Error
symptom
LED SIGNAGE
partial screen
turns into black
Make sure the cables below are properly connected
- DC POWER CABLE(Connect 3.8V PSU)
B. Power error
No Power to partial screen
☞B2
Check cable connection
Power connection between 3.8V PSU and Hub
Board
Replace HUB Board
Y
OK?
N N
☞B2
Y
OK?
Check HUB Board(3.8V)
N
Replace 3.8V PSU
Replace Power
Controller Board
Re-connection AC
cable between left
half and right half
cabinet
6
Established
date
Revised date
Multiple LDM remain
black screen?
N
☞B3
Check connection AC cable
Y
OK?
between left half and right
half cabinet
N
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Y