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32LS341C, 32LS3450, 32LS345Y (CHASSIS:LB21C) - LG TV Service Manual (repair manual). Page 18

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6. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
JK802 
Pin 15, 16
I2C Signal
Check JK802
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
No
Replace Main Board
No
Check HDMI_DET(HPD)
No
ok
Replace R830
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