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60LS5700, 60LS5750, 60LS579C (CHASSIS:LA22E) - LG TV Service Manual (repair manual). Page 24

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6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
R3643, R3644(SCL,SDA)
Check JK3603
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
Replace LGE2112(IC105) or Main Board
ok
Replace Jack
Check DSUB_DET
Replace Jack
No
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board
ok
No
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