Earphone Trouble - LG KP110 Service Manual

4. TROUBLE SHOOTING

4.10 Earphone Trouble

TEST POINT
CIRCUIT
AUXIN
AUXIP
AUXON_FM_L
AUXOP_FM_R
R439 0
USB+
0
R440
USB-
VA402 VA401
TP4
UART_TX
UART_RX
LGE Internal Use Only
TP1
TP4
2V5_VMIC
TP2
R412
1.5K
C409
R413 2.2K
0.1u
C410 C411
DNI 10u
ECCH0003002
C412 0.1u
C414
39p
VUSBIN_IO
TP3
nJACK_DET
C418 C419
39p 39p
2V8_VEXT
RPWRON
2V8_VEXT
nDSR_DET
C435
C424
VA404
Figure 4.10
C436 10u
AUXOP
ECTZ0003701
C415 33u
HP_R
ECTH0003401
4 7
C437 10u
IN2 OUT2
AUXON
5 6
ECTZ0003701
IN3 OUT1
C416 33u
11 HP_L 12
GND_PAD IN_PAD
ECTH0003401
NCP347MTAFTBG
EUSY0356701
FB401
1800
for RADIO
2V8_VEXT VBAT
CN401
VCHARGE_IO
R420
R419 21
19
100K
1
100K
for RADIO
2
3
FB402 1800
4
FB403 1800
5
6
7
FB404
8
9
10
11
12
13
14
15
16
17
18
VA406
C422 VA403
20
DNI 1 uF 22
HSEJ-18S
ENRY000
VA405
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 58 -
CN401
TP2
TP3
2V8_VEXT
U402
10 8
AUXOP_FM_R
1B0 1A
1 7
1B1 S1
2 5
2B0 2A AUXON_FM_L
3 6
2B1 S2 HEADSET_RADIO_SEL
DNI_
4 9
GND VCC
(16
R407
FSA2268TUMX C404
EUSY0340301
0.1u 100K
TP1
Only for training and service purposes