LG 32LN5300-UB - All Source Audio Troubleshooting; Digital;Analog TV Audio Troubleshooting

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Only for training and service purposes
7. All Source Audio
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)
8. Digital/Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.