Headphone Trouble - LG 410G Service Manual

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
TP1
R317 1.2K
L300 100nH
C319 0.1u
HSMIC
C320
2200p
HOOK_DETECT
C321 22u
HSOL
USB_DP
USB_DM
JACK_DETECT
RPWON
FB306
UART_DSR
R324
UART_TX
R325
UART_RX
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
V_IO
R316
150
C344 R332
47p 100ohm
C317 C318
VBAT V_IO
120p 1u
R319
2.2K
47
47
C329
R329
VA306 VA307
10u
2200p
4.7K
C326
-51-
V_IO
U302
FSA4157L6X
6 1
B1 S POP_NOISE
5 2
GND VCC
4 3
B0 A
FB300
1000
R318
0
V_IO
VBUS_IN VCHG_IN
R320
2.2K
FB301
R322 22
R323 22
FB399
FB302
FB304
FB305
FB307
BLM15AB601SN1
C330 C331
4.7u
56p
C333
10u
(2012)
(10V,Z,Y5V) (50V,J,NP0)
- 55 -
4. TROUBLE SHOOTING
TP2
TP1
TP2
UART_TX_TEST
UART_RX_TEST
USB_DP_TEST
USB_DM_TEST
CN302
GU041-18P-E1000
21
19
1
2
3
4 L301
5 270nH
6
7
8
9
10
11
12
13
14
15
16
17
18
20
C332
L302
22
24p
100nH
LGE Internal Use Only
FM_ANT