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8. All Source Audio Trouble Shooting
Make sure you can't hear
any audio
Y
Check Speaker
N
No audio?
di ?
Y
Check Connector P3801
No audio?
Y
Check Signal at Coil
L3802, L3803, L3804,
L3805
Is there any pulse signal?
Y
Check Main IC I2C / I2S
signal out put with user
menu volume up/down test
Y
Maybe Audio Digital AMP has
problems. (IC3801, STA380BWF)
Replace It
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Only for training and service purposes
N
Replace Speaker
p
p
N
Replace Connector
Replace one of Coil
N
N
L3802, L3803, L3804,
L3805
& Recheck signal
ok?
Y
Replace It & Recheck
Maybe MTK IC LGE2122 (IC105)
N
has problems
Replace it
Replace one of Resistor /
Capacitor & Recheck signal
Capacitor & Recheck signal
ok?
N
Resistor : R3810, R3811,
R3812, R3813
Capacitor : C3810, C3811,
C3814, C3815
C3817 C3825
C3817 ~ C3825
Y
Check IC3801 Power
OK
N
Follow Power UP_Boot Fail
(17V : C3821,
trouble shooting guide
3.3V : C3805)
Y
LGE Internal Use Only
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