![background image](http://html.mh-extra.com/html/samsung/sgh-x520/sgh-x520_service-manual_1191276054.webp)
Flow Chart of Troubleshooting
9-18
R406
TA400
L407
C412
C409
6
6
ANT401
1 1
2
2
3
3
4
4
5
5
C401
1
1
2 2
3
3
4
4
5
5
6
6
3
OUT
OUT 4
ANT400
F401
2
G
5
G
IN
1
C410
C424
L402
L405
C418
C404
C402
C413
C411
3
2
C
C
V
9
VMOD_EN
8 VRAMP
6 VTX
L409
18
RX2
16
RX3
14
RX4
2
1
V
7 VBATT
4 VBS1
5 VBS2
10
1
C
C
V
1 DCS|PCSIN
31
1
D
N
G
51
2
D
N
G
3
D
N
G
71 91
4
D
N
G
12
5
D
N
G
11
GSM850|900TXIN
20
RX1
U401
12
ANT
L403
C416
C403
A
2
3
C
1
G
4
G
RFS400
C422
C405
C423
VBAT
5
G
IN
1
3
OUT
OUT 4
C417
F402
2
G
C408
C414
R400
C400
C420
L401
L408
C421
C419
F403
2
G
5
G
IN
1
3
OUT
OUT
4
GSM_LNA_IN_N
GSM_LNA_IN_P
DCS_LNA_IN_P
DCS_LNA_IN_N
PCS_LNA_IN_P
PCS_LNA_IN_N
GSM_PAM_IN
DPCS_PAM_IN
TX_EN
VMOD_EN
VAPC
BAND_SEL2
BAND_SEL1
ANT