LG KE820 - My stuff; Videos

5. Trouble shooting
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5.6 Receiver & Speaker trouble
Check Points
-Speaker spring contact
-Audio amp soldering
-analog switch soldering
0.22u
C447
4.7KR236
3V3_AUDIO
0R437
2V72_IO
R439 NA
C236
0.1u
A5
LIN
LOUT
E5
D1
MONO+
B1
MONO-
B5
NC1
NC2
D2
B4
PHONE_IN
RHP3D1
A4
RHP3D2
A3
RIN
D4
D5
ROUT
SCL
B2
SDA
A1
C2
VDD1 VDD2
C3 C4
VDD3
VOC
E2
CBYPASS
GND1
C1 C5
GND2
A2
I2CSPIVDD
I2CSPI_SEL
E1
B3
ID_ENB
D3
LHP3D1 LHP3D2
E3
E4
U210
LM4845
NAR438
1u
C237
R229 100K
C248
470n
C247
0.1u
3V3_AUDIO
100p
C241
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
VCC
NLAS5223BMNR2GU208
100p
C242
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
VCC
U211 NLAS5223BMNR2G
COM1
3
COM2
9
C240
100p
C243
100p
C244
0.1u
4.7KR237
0R442
C238
4.7u
0.068uC250
0.1u
3V3_AUDIO
C251
0R436
220n
220n
C245
C239
C249 0.068u
AMP_IN_R
AMP_IN_L
BBP_SND_R
FM_BBP_SEL BBP_SND_L
FM_SND_L
AMP_IN_L
AMP_IN_R
FM_SND_R
SPK_N
SPK_RCV_N
RCV_N
SPK_P
SPK_RCV_P
RCV_PSPK_RCV_SEL
HS_OUT_L
SPK_P
SPK_N
HS_OUT_R
SDA
SCL
Check signal
flow via
Inductor
Check the contact spring
tension and dust on the
contact point
Check Audio
amp, In output
signal
Check the
analog switchs