LG D686 - Page 96

3. TROUBLE SHOOTING
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Only for training and service purposes
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Case B. No Sound from Headset
Check the input power +VBATT and Gain Parameter . (C517, R505)
In case of you can’t heard anything, check C518~521
Can heard sound but sound is abnormal, check C533,C534
TOP
U503
0
R502
21
C524
1u
C520 1u
1uC518
1uC521
C519
1u
2.2u
C517
VBATT
U503
D4 D3
D2
D1
C4
B4
B3
A4
A2
B2
C1
A1
B1
C2
A3
C3
SGND
OUTL
HPVSS
GND
EN
CPN
CPP
VDD
INL-
HPVDD
INL+
INR+
HI-Z
GAIN
OUTRINR-
+1V8_VIO_MTK
100K R505
2
R503
DNI
2
2.2u
C523
C522
1u
HPH_R
HPH_L
Headset_AMP_EN
HP_AMP_SGND
EAR_R
EAR_L
U503