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32LD360L (CHASSIS:LA04Z) - LG TV Service Manual (repair manual). Page 33

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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 & EEPROM
IC8401  I2C Signal R8415, 
R8416, R8417,R8421(SDA,SCL)
Check P8400
H/V_Sync/R/G/B Signal Line
R8408, R8409, R8410
ok
ok
ok
No
No
Re-download EDID data or Replace the defective IC 
ok
Replace Jack
Check DSUB_DET
Replace R8425
No
ok
No
Check FRC and BCM LVDS Output
Replace Mstar(IC9001) or BCM( IC900)
or Main Board.
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