Read LG 42LV3700-UD (CHASSIS:LA12B) Service Manual online
7. Trouble shooting - No video (HDMI)
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
for damage or open conductor.
Check HDMI Switch
IC701 video Signal and I2C line
Check JK70 1 / 2 / 3 / 4
ok
ok
ok
No
No
Replace Coil
ok
Replace Jack
Check HDMI Signal output
of HDMI Switch (IC701)
Replace the defective IC.
No
Check L2103(+3.3V)
Replace the defective IC.
No
OK
ok
No
Check BCM LVDS Output
Replace BCM( IC101) or Main Board.
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