Read LG 50LN5420-TC (CHASSIS:LB36B) Service Manual online
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6. MHL Video
7. All Source Audio
Check input signal format.
Is it supported?
Check MHL Cable conductors
for damage or open conductor.
Check MHL Signal (R214, R215)
Check JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
Replace Jack
Check MHL Signal
Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board .
ok
No
Replace Main Board
No
Check CD_Sense, Cbus, Vbus
No
Replace R810, R802, R831, R830, IC802, D800
Check the TV Speaker Menu
(Menu - > Audio - > TV Speaker)
On
ok
ok
Check Output Signal P3401
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC3401).
ok
No
Check Connector & P3401
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu.
Check AMP IC(IC3401) Power
24V, 3.3V
No
Replace Amp IC(IC501).
Check Mstar I2S Output
IC3401 37,38,39 Pin
No
Check signal line. Or replace Mstar(IC101).
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R3406, R3407
No
Check signal line. Or replace Mstar(IC101).
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