Headphone Trouble - LG KG270 Service Manual

4.13 Headphone Trouble

TEST POINT
Check Points
-18pin IO connector
-Passive Parts slodering Status
CIRCUIT DIAGRAM
2V8_VIO
AUXOP_FML
AUXOP_FMR
TXD
RXD
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Only for training and service purposes
VMIC
C317
R318
AUXIN
2.2K
0.1u
C318 C319
10u
NA
C320 0.1u
AUXIP
2V8_VIO
C323 10u
C324 10u
HS_DET
4. TROUBLE SHOOTING
C321
C322
FB300
FB302 FB301
EAR_MIC
I/O CONNECTOR
VBAT
CN301
VCHARGE
FOR RADIO
FB300 1800
FB301 1800
FB302 1800
2V8_VIO
10
11
RPWRON
12
R324
13
100K
14
DSR
15
16
C327 C328
17
10u 56p
18
(2012)
(10V,Z,Y5V) (50V,J,NP0)
HSEJ-18S04-25R
VBAT
R332 0
BATT_TEMP
CN302
C336 C337
3p 18p
(50V,J,NP0)
(50V,C,NP0)
(TOL:0.25P)
- 75 -
CN301
FM_ANT
L300
270nH C322
10p
1608
21
19
FOR RADIO
1
2
2 : AUDIO
3
4
4 : EAR_L
5
5 : EAR_R
6
6 : TXD
7
7 : RXD
8
8 : JACK_D
9
9,10 : BATT
11 : R/ON
12,13 : CHG
20
22
3
2
1
LGE Internal Use Only