LG 39LB5600 Service Manual page 19

6. MHL Video
Check input signal format.
Is it supported?
ok
Check MHL Cable conductors
for damage or open conductor.
ok
Check MHL Signal (R214, R215)
ok
Check JK801
ok
Check CD_Sense, Cbus, Vbus
ok
Check MHL Signal
ok
Check Mstar LVDS Output
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Only for training and service purposes
No
Replace the defective IC or re-download EDID data
No
Replace Jack
No
Replace R817, C800
No
Check other set
If no problem, check signal line
No
Replace M star(IC101) or M ain Board.
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No
Replace M ain Board
LGE Internal Use Only