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7. All Source Audio
Check the TV Speaker Menu
(Menu -> Audio -> TV Speaker)
On
Check AMP IC(IC3401) Power
24V, 3.3V
ok
Check Mstar AUDIO_MASTER_CLK
R148
ok
Check AMP I2C Line
R3406, R3407
ok
Check Mstar I2S Output
IC3401 37,38,39 Pin
ok
Check Output Signal P3401
1, 2, 3, 4 pin.
ok
Check Connector & P3401
ok
Check speaker resistance
and connector damage.
8. Digital/Analog TV Audio
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
ok
Check IF_P/N Signal
TU3700 10/11 Pin
ok
Follow procedure
'7. All source audio'
trouble shooting guide.
Copyright ©
LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Off
Toggle the Menu
No
Replace Amp IC(IC501)
No
Replace Mstar(IC101) or Main Board.
No
Check signal line. Or replace Mstar(IC101)
No
Check signal line. Or replace Mstar(IC101)
No
Replace Audio AMP IC(IC3401)
No
Replace connector
if found to be damaged.
No
Replace speaker.
No
Replace L3703
No
Replace IC3703
No
Bad Tuner. Replace Tuner.
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LGE Internal Use Only
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