LG LAEC015 Service Manual page 27

Standard Repair Process
AIO136
Error
symptom
LED SIGNAGE
partial screen
turns into black
Make sure the cables below are properly connected
- LAN (Video data connection)
- DC POWER CABLE (3.8V PSU connection)
Replace FPGA Board
Y
OK?
N
Replace HUB Board
A. Video error
No video (partial screen turns into black)
☞A2_ ②
Check cable connection
① LAN connection between HUB Board
② Power connection between 3.8V PSU
Replace HUB Board
Check If only the
Y
vertical 2ea of LDM are
problem
Replace LAN cable
Y
OK?
N N
Y
OK?
Check LDM Module
N
Replace LDM Module
Check LAN cable
OK?
(Internal connection of
LAN cable)
N
Re-connect LAN
cable between left
half and right half
cabinet
2
Established
date
Revised date
Multiple LDM remain
black screen?
N
☞A2_ ①
Check Connection of LAN
Y
OK?
cable between left half and
right half cabinet
N
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Y