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4.15.6 Microphone for main MIC
Main Microphone path as below:
MIC → C245,C248 → U202(audio codec) → C229,C230 → MSM6275A →
MIC feed back gain logic → MSM internal CODEC
R221
WM_MICBIAS
MIC200
1
C246
C247
2
39p
10p
SUMY0009203
C251
39p
[main MIC]
Start
Make a call
MIC_BIAS(C102) is 2.7V?
YES
make some sound or
voice to MIC
Can you scoping some
sound signal at C245,C248?
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
C245,C248
WM_MIC1P
C245 1u
WM_MIC1N
C248
1u
C252
39p
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
WM_MIC1N
MIC1N
C1
WM_MIC1P
MIC1
[audio codec]
E2
WM_MIC2N
MIC2N
D1
WM_MIC2P
MIC2
B4
WM_MICBIAS
MICBIAS
C234
4.7u
C235
C236
4.7u
4.7u
AU_19.2M
WM_AVDD
WM_DVDD
C600
10p
SDCC_DAT2_GPIO100
- 139 -
WM_AVDD
C229,C230
E9
OUT4
E8
OUT3
D8
LOUT1
1u
C229
B7
U202
MONO2
1u
C230
B6
WM8753LEB-RV
MONO1
D9
ROUT1
A9
LOUT2
B9
ROUT2
100K
R213
100K R214
100K
R215
L600
100nH
Place near
C607
C608
C609
MSM pin W18
0.1u
NA
NA
10%
(CODEC VSS)
F25
SDCC_DAT1_GPIO99
M25
M26
[MSM6275A]
LGE Internal Use Only
WM_MONO2
WM_MONO1
WM_ROUT1
WM_LOUT2
WM_ROUT2
C610
C611
NA
NA
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