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4.15.7 Microphone for headset
MIC for Head_Set path as below:
Insert Headset → EAR_SENSE_N(pin8) go 0V → MSM6275A and STN8810 sense Head_Set
insertion → MIC signal → U202(audio codec) → MSM6275.
C239
10p
AP_VDD_IO_1.8V
C240,C241
CN202
100K R219
21
19
1
2
3
FB503 1000
4
R222
68
C242
33u
5
6
R223
68
C244
33u
7
8
FB245
9
10
11
U205
12
1608
1
2
IN
OUT
13
R225 NA
14
3
4
G1
G2
15
16
NFM21PC105B1A3
17
18
20
22
[CN202(headset connector)]
Start
Make a call
Try change the head set
NO
EAR_SENSE_N is 0V?
YES
MIC_BIAS is 2.7V ?
YES
make some sound or
voice to MIC
Can you scoping some
sound signal at C240,C241?
YES
Can you scoping some
sound signal at C229,C230?
YES
Work well?
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
C238
C237
R216
0.1u
R217
1M
2.2K
10u
5
VIN-
4
VCC
1
HOOK_SENSE
VIN+
3
OUT
GND
U203
2
NCS2200SQ2T2G
R218
330K
C240
1u
WM_MIC2N
C241
1u
WM_MIC2P
WM_LOUT1
WM_ROUT1
USB_D+
USB_D-
CONNECTOR VBATT_SENSE PIN CHECK!!
EAR_SENSE_N
1%
VBATT
R224
VBATT_SENSE
REMOTE_PWR_ON
470K
+5V_PWR
USB_VBUS_IN
UART_TXD
UART_RXD
VREG_MSMP_2.7V
1%
CN203
1
5
2
C253
VBAT_TEMP
4
33u
3
C260
0.1u
YES
END
NO
Change the Main b'd
NO
Change the Main b'd
NO
Change the MIC
NO
Check the U202 or
Change the Main B'd
YES
END
4. TROUBLE SHOOTING
WM_DVDD
C222
1u
A2
WM_HPH_R
LINE1
C224
1u
A1
WM_HPH_L
LINE2
C225
1u
B1
WM_RXP
RXP
C226
1u
C2
WM_RXN
RXN
A3
ACIN
B3
ACOP
D2
[audio codec]
WM_MIC1N
MIC1N
C1
WM_MIC1P
MIC1
E2
WM_MIC2N
MIC2N
D1
WM_MIC2P
MIC2
B4
WM_MICBIAS
MICBIAS
C234
4.7u
MDP_VSYNC_SECONDA_GPIO104
MDP_VSYNC_PRIMARY_GPIO105
- 141 -
WM_AVDD
C229,C230
E9
OUT4
E8
OUT3
D8
LOUT1
1u
C229
B7
U202
MONO2
WM_MONO2
1u
C230
B6
WM8753LEB-RV
MONO1
WM_MONO1
D9
ROUT1
WM_ROUT1
A9
LOUT2
WM_LOUT2
B9
ROUT2
WM_ROUT2
L600
100nH
C600
10p
Place near
C607
C608
C609
MSM pin W18
0.1u
NA
NA
10%
(CODEC VSS)
F25
SDCC_DAT1_GPIO99
M25
SDCC_DAT2_GPIO100
M26
SDCC_DAT3_GPIO101
AE3
AD2
[MSM6275A]
LGE Internal Use Only
C610
C611
NA
NA
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