LG -E450 Service Manual page 146

Case A. Disable detected headset insert.
HOOK_DETECT
EARMIC_BIAS
EARMIC_N
C510
DNI
EARMIC_P
C513 C514
1n 1n
MAIN GND
LGE Internal Use Only
R512
10K
R517
47K
2.2K
HS_JACK_DET
R569
EAR_L
EAR_R
L500
FM_ANT
Ear Jack
Connector
+1V8_VIO_MTK
100n
C517 C518
22n 22n
L501
R579
100n
DNI
Close to 3.5pi ear-jack
R520 100p
FM_RX_IN_N
R521
MAIN GND
HS_GND
DNI
- 146 - Copyright © 2013 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Ear Jack
Connector
HS_JACK_DET
HIGH(DEFAULT)
LOW
S/W_Detect
FB503 1800
R583 10
SPK_L
FB500 1800
R584 SPK_R
10 FB501 1800
GND
MIC
FB502 1800
ZD501 ZD502 ZD503 ZD504
Only for training and service purposes
STATE
UNMATING
MATING
J501