LG 42PM4700 Service Manual page 38

2. No OSD Trouble Shooting
Check P1100 5V_ON
Y
Check 5V Voltage Level
at P1100
Y
Check 5V Voltage Level
at L1102
Y
Check all multi voltage
(12v, 3.3v, 1.2v)
Y
Check LVDS Cable
Y
Check PDP Module
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Only for training and service purposes
N
Check GPIO Path of Micom
N
Check Power connector
N
Replace one of L1102
& Recheck
N
Check power up boot sequence
N
Replace Cable
Y
Replace Power board
LGE Internal Use Only