LG LAEC015 Service Manual page 26

Standard Repair Process
AIO136
Error
symptom
LED SIGNAGE
☞B1_②
Entire screen
Check the power supply
turns into
status of the Main board.
black
Y
OK?
Replace Power
Controller Board
Replace AC power Cord
A. Video error
No video (Entire screen turns into black)
OK?
(5V_ST)
N
Check Power Controller
Board
N
① Replace Vby1 CABLE
② Replace FPGA Board
☞B1_①
Y
Check the power supply
status of the Main board.
(12V)
☞B4
Check the LED indicator on FPGA board
① Check connection with Main Board
② Verifying normal operation of FPGA
1
Established
date
Revised date
☞B1_③
Y
Check the power of FPGA
OK?
N
Replace 12V PSU
☞A1
Y
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board(12V)
OK?
N
① Replace 8pin CABLE
② Replace Main Board