4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
Case B. No Sound from Headset
Check the input power +VBATT and +1V8_VIO_MTK . (C402, C400, C401)
In case of you can’t heard anything, check C407, C408
Can heard sound but sound is abnormal, check C517,C518
U401
C407 2.2u
2.2u
C408
FB400
120
C400
2.2u
C412
39n
39n
C410
120
FB401
C417
2.2u
2.2u
C402
C418
2.2u
C416
2.2u
C401
100n
U401
D3
C1
E2
A2
C2
B2
B4
A4
B3
E1
A3
D1
A1
C3
B1
E4
E3
C4
D4
D2
HPVD
D
SPVD
D
IN3-
OUT+
OUT-
HPL
IN3+
HPR
CP
IN1+
CN
IN1-
IN2+
IN2-
SDA
SCL
BIAS
CPVD
D
CPVSS
GND
C413
2.2u
R403
0
+1V8_VIO_MTK
VBATT
I2C_SENSOR_SDA
I2C_SENSOR_SCL
HPH_L
HPH_R
SPK_OUT_P
SPK_N
SPK_P
SPK_OUT_N
EAR_R
EAR_L
HS_GND
MAIN GNDMAIN GND
MAIN GND
RCV CALL
0ohm SHORT PAD : SAFP0000401 (0603)
0ohm OPEN PAD : SAFO0000401 (0603)