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4. TROUBLE SHOOTING
4.10 Headphone Trouble
TEST POINT
Check Points
-18pin IO connector
-Passive Parts soldering Status
TP1 (C321), TP2 (FB300) : Audio path
-> Audio signal Check
CIRCUIT
R317
L300
C319
0.1u
HSMIC
C320
TP 1
2200p
HOOK_DETECT
C321
22u
HSOL
USB_DP
USB_DM
JACK_DETECT
RPWON
UART_DSR
UART_TX
UART_RX
VA304
VA305
LGE Internal Use Only
V_IO
R316
150
1.2K
C317
C318
VBAT
120p
1u
100nH
FB306
R324
47
R325
47
C329
R329
VA306
10u
2200p
4.7K
C326
V_IO
U302
FSA4157L6X
6
1
B1
S
POP_NOISE
5
2
GND
VCC
4
3
B0
A
FB300
V_IO
V_IO
VBUS_IN
VCHG_IN
R319
R320
2.2K
2.2K
BLM15AB601SN1
VA307
VA308
VA309
C330
C331
4.7u
56p
C333
10u
(2012)
(10V,Z,Y5V)
(50V,J,NP0)
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 64 -
TP2
TP1
TP 2
CN302
GU041-18P-E1000
21
19
1
FB301
FM_ANT
2
3
4
L301
270nH
5
R322
22
6
R323
22
7
FB399
8
9
10
FB302
11
FB304
12
FB305
13
14
FB307
15
16
17
18
20
C332
L302
22
24p
100nH
Only for training and service purposes
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