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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
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4.10 Headphone Trouble
TEST POINT
CIRCUIT
Check Points
-18pin IO connector
-Passive Parts soldering Status
TP1
TP2
TP1
(C321),
TP2
(FB300) : Audio path
-> Audio signal Check
(2012)
(50V,J,NP0)
(10V,Z,Y5V)
1u
C318
FB302
L301
270nH
100nH
L302
R319
V_IO
2.2K
U302
FSA4157L6X
A
3
4
B0
6
B1
GND
5
S
1
VCC
2
VCHG_IN
47
R325
7
8
9
12
13
14
15
16
17
18
19
2
20
21
22
3
4
5
6
GU041-18P-E1000
CN302
1
10
11
VA
3
0
9
C329
2200p
BLM15AB601SN1
FB307
VA
3
0
8
FB305
R329
4.7K
R332
100ohm
C330
4.7u
C319
0.1u
FB304
C344
47p
C332
24p
1000
FB300
VA306
100nH
L300
VA
3
0
4
VBAT
V_IO
R324
47
R317
1.2K
22u
VBUS_IN
C321
VA307
2200p
C320
C317
120p
56p
FB301
C331
FB306
C333
10u
R318
0
R323
22
FB399
R322
22
R320
2.2K
150
R316
V_IO
V_IO
10u
C326
USB_DM_TEST
USB_DP_TEST
UART_TX
UART_RX
UART_TX_TEST
VA
3
0
5
HOOK_DETECT
USB_DP
USB_DM
FM_ANT
UART_DSR
POP_NOISE
RPWON
JACK_DETECT
UART_RX_TEST
HSMIC
HSOL
TP2
TP1