LG D686 Service Manual page 96

Case B. No Sound from Headset
HPH_L
HPH_R
Headset_AMP_EN
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
LGE Internal Use Only
U503
TOP
C519
1u
A4
INL-
C518 1u
B4
INL+
C521 1u
D4
INR-
C520 1u
C4
INR+
D2
GAIN
+1V8_VIO_MTK D1
HI-Z
2
R502
2
- 96 -
3. TROUBLE SHOOTING
VBATT
C517
2.2u
U503
A2
B3
HPVDD
B1
GND
A3
OUTL
D3
OUTR
U503
C522
B2
CPP
C1
CPN
1u
C3 A1 C2
C524
1u
Copyright © 2013 LG Electronics. Inc. All right reserved.
EAR_L
EAR_R
C523
2.2u
Only for training and service purposes