4.12.5 Microphone for headset
MIC for Head_Set path as below:
Insert Headset
→
EAR_SENSE_N(pin8) go 0V
→
MSM6280 sense Head_Set insertion
→
MIC signal
→
U502(audio codec)
→
MSM6280.
Start
EAR_SENSE_N is 0V?
END
Make a call
Change the Main b'd
Change the Main b'd
MIC_BIAS is 2.7V ?
YES
YES
NO
NO
NO
Try ch ange the head set
Can y ou s coping s ome
sound signal at C539?
Change the MIC
YES
YES
make some sound or
vo ice t o MIC
Work w ell?
END
YES
Can y ou s coping s ome
sound signal at C235,L20 0?
Check t he U502 or
Change the Main Bíd
NO
NO
YES
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 134 -
8
9
12
13
14
15
16
17
19
2
21
3
4
5
6
7
CN500
1
10
11
R528
100K
FB504
VREG_MSMP_2.7V
2.2uH
L504
TV_OUT
EAR_MIC_P
RMT_PWR_ON_N
RMT_INT-USB_D+
RMT_ADC-USB_D-
VBATT
FM_ANT
UART TXD
USB_VBUS
MIDI_EAR_L
MIDI_EAR_R
EAR_SENSE_N
FB501
FB500
R2_GPIO3
6
RIN
5
4
RIP
ROUT1
29
ROUT2
23
16
SCLK
27
VMID
DACDAT
10
L2_GPIO2
3
LIN
2
1
LIP
LOUT1
30
25
LOUT2
7
LRC
11
MCLK
MICBIAS
32
18
MODE
OUT3
22
21
OUT4
ADCDAT
9
24
AGND2
AUXL
19
AUXR
20
8
BCLK
15
CSB_GPIO1
10u
C525
C534
1u
K
9
NA
C531
C539
1u
C524
0.1u
NA
C544
C543
NA
MIC_PWR
MMP_A_MCLK
CODEC I2C SCL
HP_EAR_L
MIC2P
HP_EAR_R
MID_MICP
MMP_A_BCLK
MMP_ADO_DACDAT
MMP_A_LRCLK
MMP_ADI_ADCDAT
SPK_OUT-
C204
NA
C2
0.1u
C235
C236
0.1u
L200
100nH
NA
C203
C200
10p
SDCC_DAT1_GPIO99
SDCC_DAT2_GPIO100
SDCC DAT3 GPIO101
MIC1N
AF20
MIC1P
AE20
AF21
MIC2N
AF22
MIC2P
LINE_L_IN
AC21
AC20
LINE_R_IN
LINE_R_IP
AC19
CCOMP
AA20
AF19
AUXIN
AE19
AUXIP
MIC1P
MIC1N
MIC2P
Содержание U990
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