Samsung SGH-E810 Service Manual page 15

SGH-E810 Flow Chart of Troubleshooting
VBAT
C402
C403
100UF
10NF
6.3V
R401
100K
TXPOWER
TX_EN
TX_BAND_SEL
C411
C412
270PF
33PF
DCS_PAM_IN
R403
820
GSM_PAM_IN
R406
220
VPAC
13
GND
VRAMP
6
GSM850/900OUT
VREG
5 9
PCSOUT
VBATT
4 11
GSM850/900IN
L402
3 TXEN 7
DCSIN
2.7nH
21
BAND
C407
C408
10 8 12
0.5PF
U400 0.75PF
C413
RF3140
1NF
R402
10
R404
820
R405
15
R407
270
GSM_PAM_IN
DCS_PAM_IN
22 23
21
GSM_LNA_IN_N
RFIGN
20
GSM_LNA_IN_P
RFIGP
19
DCS_LNA_IN_N
RFIDN
18
DCS_LNA_IN_P
RFIDP
17
RFIPN
16
RFIPP
15
GND
SERDAT
SERCLK
SERLE
SI_EN
C433 C434
33PF 33PF
TRANSMITTER & RECEIVER
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C401
47PF
U401
L401 C404
47PF
6.8nH
5
EGSM_TX
3
DCS_TX
10
EGSM_RX
C405 1
DCS_RX
22PF
G G G
C406
L403
2.2PF 14 13 12
NC
C415
22PF
C418
47PF
VRF
C420
C421
100NF 33PF
29 30 31 32 33 34
24 25 26 27 28
35
GND
36
GND
RXQP
1
RXQN RXQN
2
RXIP RXIP
U404
3
RXIN RXIN
4
TXIP TXIP
5
TXIN TXIN
6
TXQP TXQP
7
TXQN TXQN
14 13 12 11 10 9 8
CLK13M_R
VRF
C430
C431 C429
1UF 33PF
22NF
C435
33PF
2-12
CN400
R400
0
1 2
IN OUT
G1 G2
3 4
L407 C400
15nH NC
8
ANT 2
VC2 DCS_TX_EN
11
VC1
GSM_TX_EN
G G G G
9 7 6 4
C409 C410
33PF 33PF
U402
C414
3 2.2PF
DCS_LNA_IN_N
OUT
1
IN
4
L404
OUT
G G C416
6.8nH
2.2PF
2 5
DCS_LNA_IN_P
U403
C417
0.75PF
3
OUT GSM_LNA_IN_N
1
IN
4
L405
G G OUT
C419
27nH
0.75PF
25
GSM_LNA_IN_P
ANT
ANT1
ANT_GND