LG -S310 Service Manual page 90

4.9.6 Headset MIC Trouble
Check Headset voice signal path
-MUIC (U400),
-HS_MIC_P (TP1)
-HP_ MIC_P (TP2)
UART_TX_DATA
UART_RX_DATA
USB_DM
USB_DP
HS_OUT_L
HS_OUT_R
R407 100K HS_MIC_P
VUSB_BUS
MUIC_INT_N
MUIC_I2C_SDA
MUIC_I2C_SCL
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Only for training and service purposes
C4
UART_TX
C3
UART_RX
D4
USB_DM
E4
USB_DP
D1
TP1
AUDIO_L
C1
AUDIO_R
A4
MIC
C2
DSS
B3
_INT
A2
SDA
B2
SCL
D2
GND
C406 C407 C408
47p 22p 22p
Figure 4.9.6.1 WM9093 check point
Figure 5.9.6.2 Headset MIC check point
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4. TROUBLE SHOOTING
C517
27p
C518 0.1u
HP_MIC_N
C520
39p
TP2
HP_MIC_P
C521 0.1u
C523
27p
TP1
C519
R504
2.2u
2.2K
ECCH0000198
TP2
(2.2uF,6.3V,10%,1005)
HS_MIC_P
C524
120p
LGE Internal Use Only