Service manual

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Flow Chart of Troubleshooting

10-21

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L105

C106

R112

R113

C133

R119

C152

C101

9

G

G

1012

G

G

1418

G

11

PCSRX

VC1

4

VC2

16

G

2122

G

G

2324

G

G

3

G

5

G

7

G

8

6

ANT

13

DCSRX

17

DPCSTX

EGSMRX

15

2

EGSM_TX

G

119

G

20

G

U100

FEM5440TSC

C114

C115

C121

VCCB_2.9V

C110C109

VRF_2.8V

C112

L103

R110

R111

C130

C118

C129

C116

C132

C111

C131

C125 C126

L106

L107

C120

L108

C117

R106

D

N

G

0

6

D

N

G

1

6

D

N

G

2

6

D

N

G

3

6

D

N

G

4

6

B

B

_

X

I

M

_

2

C

C

V

7

CAP_I+

8

CAP_I-

9

LO-

53

RX_I+

54

C

N

5

5

BANDSEL

56

BS2

57

TX_I+

58

D

N

G

9

5

EDGE_REF-

6

TX_Q-

46

D

N

G

7

4

CAP_Q+

48

C

N

9

4

EDGE_REF+

5

SX_EN

50

DATA

51

LO+

52

A

N

L

_

C

C

V

9

3

TX_Q+

4

TX_CPO

40

EDGE_LO

41

LNA900

42

LNA1800

43

D

N

G

4

4

TX_I-

45

B

B

_

C

C

V

1

3

O

C

V

_

X

T

_

C

C

V

2

3

TX_900_OUT

33

TX_1800_OUT

34

TX_TUNE

35

RX_EN

36

TX_EN

37

V

R

D

_

C

C

V

8

3

UHF_BYP

24

UHF_TUNE

25

F

H

U

_

C

C

V

6

2

O

L

_

C

C

V

7

2

RX_Q-

28

RX_Q+

29

EDGE_IF+

3

RX_I-

30

SYN_REF

17

UHF_CPO

18

N

F

_

C

C

V

9

1

EDGE_IF-

2

XTAL_TUNE

20

CLK

21

LE

22

D

D

V

3

2

LNA1900

1

CAP_Q-

10

26MHZ_PAD

11

LPF_ADJ

12

CLK_BUFF_OUT

13

D

N

G

4

1

D

C

C

V

5

1

P

F

_

C

C

V

6

1

VCCD_2.9V

VRF_2.8V

U106

C122

C127

C107 C108

R105

GSM_OUT

DPCS_OUT

GSM74945_OUT

IF_REF+

SERDAT

BAND_SEL

CHIP_EN

IF_REF-

DCS_TX_EN

GSM_TX_EN

IF_OUT-

SERCLK

SERLE

IF_OUT+

LO

DCS74945_OUT

RX_EN

SX_EN

RTX_QN

RTX_QP

RTX_IN

RTX_IP

TX_EN

CLK13M_RF