LG 55G2 Service Manual page 72

6. Trouble shooting - No video (RGB-PC)
Check input signal format.
Is it supported?
ok
Check RGB Cable conductors
for damage or open conductor
ok
Check EDID & EEPROM (in HDMI SW IC)
IC3201 I2C Signal R3644, R3643(SDA,SCL)
ok
Check JK3603
H/V_Sync/R/G/B Signal Line
R579/R580/L502/L500/L501
ok
Check DSUB_DET
ok
Check L9 Ace (IC101) Chip
ok
Check L9 D-chip (IC100) Chip
Copyright ⓒ 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No
Re-download EDID data or Replace the defective IC
No
Replace Jack or Replace the defective element
No
Replace R3646
No
Replace IC101
No
Replace IC100 or Main Board.
LGE Internal Use Only