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4. TROUBLE SHOOTING
4.10 Headphone Trouble
Check Points
-18pin IO connector
-Passive Parts soldering Status
TP1 (C321), TP2 (FB300) : Audio path
-> Audio signal Check
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
TP2
TEST POINT
(50V,J,NP0)
(2012)
(10V,Z,Y5V)
VA307
C320
2200p
FB304
1.2K
R317
FB399
VBUS_IN
22u
C321
R318
0
VA304
C326
VA305
10u
FB305
4.7K
R329
FB300
22
R323
VA309
4.7u
C330
VA308
0.1u
C319
24p
C332
2.2K
R320
R316
150
120p
47
R324
C317
VA306
100nH
FB301
L300
C331
V_IO
VBAT
56p
V_IO
V_IO
270nH
L301
FB307
BLM15AB601SN1
2200p
C329
VCHG_IN
22
R322
V_IO
L302
100nH
C318
1u
FB302
10u
C333
FB306
R319
2.2K
B0
4
B1
6
5
GND
1
S
2
VCC
FSA4157L6X
U302
3
A
R325
47
3
4
5
6
7
8
9
1
10
11
12
13
14
15
16
17
18
19
2
20
21
22
CN302
GU041-18P-E1000
USB_DP
USB_DM
POP_NOISE
RPWON
FM_ANT
UART_DSR
JACK_DETECT
UART_TX
UART_RX
HSMIC
HOOK_DETECT
HSOL
CIRCUIT
TP 1
TP 2