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19LV2500-UG (CHASSIS:LA01R) - LG TV Service Manual (repair manual). Page 40

Read LG 19LV2500-UG (CHASSIS:LA01R) Service Manual online

Trouble shooting guide
6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
R138, R139(SDA,SCL)
Check JK1104
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
re-download EDID data ,Replace Mstar(IC101) or Main Board 
ok
Replace Jack
Check DSUB_DET
Replace R1146 or R1147
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
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