Ear-Mic Headset Mic Trouble Shooting - LG KM500 Service Manual

4.15 Ear-Mic Headset MIC Trouble Shooting

LAST CALL
VRIO
TP28_BB
U300
5
4
1 VCC
HOOK_DETECT
OUT 3
GND
2
LMV7291MGX-NOPB
HSOUTL
HSOUTR
HSMICBIAS
HSMICIP
JACK_TYPE
JACK_DETECT
TP29_BB
R308
TP30_BB
TP28_BB
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP29_BB
VRIO
U301 FSA4157L6X
R300
1
HOOK_EN S B1
220K
2
VCC GND
3
VIN-
A B0
VIN+
R307
3K
R308
C304 C305
2.4K
120p 10u
C310
0.1u
TP30_BB C312
120p
L305
FB302
C310
R307
VRIO
6
5
R301
4
1K
VRIO VBAT VCHG_IN
L302
100nH
L303
100nH
C308
82p
C309
C306 C307
47p
82p 47p
L305
100nH
RPWON
UART3_DSR
VBUS
L302
- 91 -
4. Trouble Shooting
18Pin IO Connector
270nH
L304
FB302
FM_ANT
VA300
EVLC14S02050
R309
21
19
47
FB303
FB304
FB305
FB300
EAR HEADSET
FB303
FB304
L303
LGE Internal Use Only
10p
C311
CN300
1
2
3
4
5
6
7
8
9
10
11
12