LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 116 -
4.11.4 Microphone for headset
MIC for Head_Set path as below:
Insert Headset
→
EAR_SENSE_N(pin8) go 0V
→
ESM6270 sense Head_Set insertion
→
MIC signal
→
U502(audio codec)
→
ESM6270.
Start
EAR_SENSE_N is 0V?
END
Make a call
Chang e th e Main b'd
Chang e th e Main b'd
MIC_BIAS i s 2.7V ?
YES
YES
NO
NO
NO
Try change the h ead set
Can you s coping some
sound signal at C539?
Chang e th e MIC
YES
YES
make some sound or
voice to MIC
Work w ell?
END
YES
Can you s coping some
sound signal at C235,L200?
Check t he U502 or
Change the Main B'd
NO
NO
YES
FB504
2
21
3
4
5
6
7
8
9
CN500
1
10
11
12
13
14
19
R528
100K
TV_OUT
EAR_MIC_P
RMT_INT-USB_D+
RMT_ADC-USB_D-
RMT_PWR_ON_N
VBATT
FM_ANT
MIDI_EAR_L
MIDI_EAR_R
EAR_SENSE_N
FB501
FB500
NA
C531
1u
C534
C524
0.1u
1u
C539
10u
C525
C543
NA
OUT3
22
21
OUT4
R2_GPIO3
6
RIN
5
4
RIP
ROUT1
29
ROUT2
23
16
27
VMID
8
BCLK
15
CSB_GPIO1
DACDAT
10
L2_GPIO2
3
LIN
2
1
LIP
LOUT1
30
25
LOUT2
7
LRC
11
MCLK
MICBIAS
32
18
MODE
ADCDAT
9
24
AGND2
AUXL
19
AUXR
20
AVDD1
NA
C544
MIC_PWR
MMP_A_MCLK
MIC2P
HP_EAR_R
MID_MICP
MMP_A_BCLK
MMP_ADO_DACDAT
MMP_A_LRCLK
MMP_ADI_ADCDAT
SPK_OUT-
HP_EAR_L
0.1u
C235
AF20
MIC1N
AE20
MIC1P
MIC2N
AF21
MIC2P
AF22
AC21
LINE_L_IN
LINE_R_IN
AC20
AC19
LINE_R_IP
AA20
CCOMP
AF19
AUXIP
AE19
AUXIN
C236
0.1u
10p
C200
C238
L200
100nH
NA
C204
C203
NA
MIC1P
MIC1N
MIC2P
[CN500(headset connector)]
[audio codec]
[ESM6270]
C539
Summary of Contents for KE990 - Viewty Cell Phone 100 MB
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