LG -E455 Service Manual page 147

Case B. No Sound from Headset
I2C_SENSOR_SDA
I2C_SENSOR_SCL
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
LGE Internal Use Only
U401
C402
C4
C3
C407 2.2u
A3
HPH_L
C408 2.2u
B3
HPH_R
A4
C410 39n
SPK_P
C412 39n B4
SPK_N
B2
C2
VBATT
+1V8_VIO_MTK
C400 C401
2.2u 100n
2.2u
MAIN GND
FB400
E3
IN3- OUT+
RCV CALL
E4
IN3+ OUT-
FB401
B1
IN1+ HPL
U401
IN1-
A1
HPR
IN2+
D1
IN2- CP
C413
2.2u
E1
SDA CN
SCL
C416 C417 C418
2.2u 2.2u 2.2u
0
R403
0ohm SHORT PAD : SAFP0000401 (0603)
0ohm OPEN PAD : SAFO0000401 (0603)
MAIN GNDMAIN GND
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4. TROUBLE SHOOTING
120
SPK_OUT_P
SPK_OUT_N
120
EAR_L
EAR_R
HS_GND
Only for training and service purposes