LG 47LM5800 Service Manual page 19

6. RGB Video
Check input signal format.
Is it supported?
ok
Check RGB Cable conductors
for damage or open conductor
ok
Check EDID
I2C Signal
R1138, R1139(SDA,SCL)
ok
Check JK1104
H/V_Sync/R/G/B Signal Line
ok
Check DSUB_DET
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
re-download EDID data ,Replace Mstar(IC101) or Main Board
No
Replace Jack
No
Replace R1146 or R1147
No
Replace Mstar(IC101) or Main Board.
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LGE Internal Use Only