SAMSUNG Proprietary-Contents may change without notice

4. SGH-X105 Flow Chart of Troubleshooting

4-1

This Document can not be used without Samsung's authorization

1. Power On

Current consumption

>=100mA

' Power On ' does not work

Voltage >= 3.3V

Download again

Charge the Battery

pin#11 >= 2.8V

Check U100 and C116

pin#39 and pin#33 =

2.8V

Check U100 and C115

Check the clock

signal at pin4 of

OSC400

Freq = 13MHz ,

Vrms ≥ 300mV

and

Vpp = 900mVpp

Check the clock generation circuit

(related to OSC400, U401 pin 19)

END

No

Yes

Yes

Yes

Yes

Yes

No

No

No

No

pin#9 = 1.8V

No

Yes

Check the V bat. Voltage

Check the pin of U100

Check the initial operation

Check the current consumption

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-2

This Document can not be used without Samsung's authorization

2. Initial

The pin #9 of U100 = 1.8V

and

the pin #10 of U100 =

2.825V ?

Initialization Failure

Check the U100

(If it has some problem, it has to be

replaced.)

END

No

Yes

Is the pin #19 of

U100

"Low -> High"?

Yes

Check the U301

There is 32.768kHz

wave forms at the C320

and C322

Check the LCD Part

Yes

No

No

Yes

Yes

Yes

The Voltage is "High"

at the C111,C118

Check the Audio Part

No

Check the U100

(If it has some problem, it has to be

replaced.)

Check the U200

The pin #25 of U100 is

"High"

Check the U100

LCD display is O.K

No

No

Yes

Yes

Sound is O.K

No

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-3

This Document can not be used without Samsung's authorization

3. Sim Part

Is there any Signals

pin#52, #53, #54 of U100?

"Insert SIM" is displayed on the LCD

Check the U301

Check the SIM Card

END

No

Yes

Yes

Yes

No

Check the U100

Is there any Signals

pin#1, #2, #3, #4 of CN100?

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-4

This Document can not be used without Samsung's authorization

VBAT

1UF

C131

C118

1U

F

1.2K,1%

R114

Q100

1

3

2

R112

0

33PF

C101

33PF

C134

33PF

33PF

C133

33PF

C104

C15

2

VBAT

VCC_1.8A

VCC

D

330K

R113

16V

C111

1UF

C132

10UF

C106

100N

F

C147

33PF

C146

33PF

ZD111

C136

33PF

33PF

C135

VBA

T

33PF

C103

100NF

C123

VCC

D

33PF

C144

15uH

L100

33PF

C151

33PF

C15

0

C14

9

33PF

33PF

C148

_SHDN

4

C139

33PF

U105

3

FB

GND

2

1

SW

5

VIN

VRF

33PF

C145

15

R135

15

R133

1UF

C112

M1

NEG

2

P O S

1

1UF

C110

100N

F

C11

3

C130

100NF

C108

1UF

VSI

M

48

9

VLDO_

2

11

39

VLDO_

3

VLDO_

4

37

VLDO_

5

33

42

VLDO_

6

40

VLDO_

7

VREF

30

VRTC

12

VDD6

7

41

1

VEXT

VIB_DRV

4

36

VL4S_A

VL4S_B

35

32

VL5S_A

VL5S_B

31

VLDO_

1

SIM_RST

53

UP_CLK

UP_IO

52

UP_RST

54

VAC

C

3

VBAT

2

10

VDD1

2

VDD3

4

38

VDD5

34

RING_DRV

RING_PW

M

55

13

RTC_ALM

N

SCLK

17

SDI

15

SDO

16

SIM_CLK

50

51

SIM_IO

49

INTR

Q

7

LED1_DRV

LED2_DRV

8

PSW1_BUF

20

21

PWR_KEEP

PWR_SW1

N

46

47

PWR_SW2

RESET

N

19

5

63

GND

GND

64

GND

65

66

GND

60

GNDD

GNDD1

6

28

GND

Q

14

EN_5A

EN_5B

27

GND

57

GND

67

68

GND

58

GND

GND

59

61

GND

GND

62

ADC_TRIG

BTEM

P

43

29

CREF

18

CSN

22

EN_3

EN_4[0]

23

24

EN_4[1]

EN_5

25

26

U100

ADC_AUX

1

44

45

ADC_AUX

2

56

C107

100NF

C138

33PF

33PF

C137

2.2UF

C105

C116

100PF

C102

100N

F

R115

0

G

9

10

G

1

1

22

3

3

4

4

5

5

6

6

G

7

8

G

CN100

VOSC

VPAC

VCC

A

RDB

11

8

RESET

B

RS

9

VC

C

29

30

VC

C

10

WRD

2

DUMMY

31

DUMMY

DUMMY

32

DUMMY

5

6

DUMMY

GND

28

3

LED+

LED-

4

D3

15

16

D4

D5

17

18

D6

D7

19

20

D8

D9

21

DUMMY

1

D1

13

22

D10

D11

23

24

D12

D13

25

26

D14

D15

27

14

D2

U104

7

CS1B

12

D0

2.2U

F

C114

1UF

C109

VRT

C

C117

1UF

R134

15K

1U

F

C11

5

VCC

B

ZD114

C143

33PF

C142

33PF

33PF

C14

1

33PF

C140

BLIGHT_P

BLIGHT_N

LCD_CSL

A(2)L

CP_WENL

CP_OENL

UP_C

S

RS

T

BLIGHT_N

BLIGHT_P

VRE

F

SIMDATA

SIMRST

SIMCLK

PWR_ON

JIG_O

N

RTCALAR

M

EN_VR

F

EN_VPA

C

XOEN

A

UP_SD

I

UP_SCLK

LED_E

N

KEY_ROW(0)

KEY_COL(2)

TA_VEXT

PWR_KEE

P

BACKLIGHT

RST

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-5

This Document can not be used without Samsung's authorization

4. Charging Part

The pin #17, #18 of

CN201 is TA_VEXT =

5V?

Abnormal charging operation

The pin #3 of U101 is

"low"?

Replace TA or Check CN201

Check the U101

Check the Q101

END

No

Yes

Yes

Yes

No

No

The pin #3 of Q101 is

"low"?

No

Solder again or change R130

Yes

The ICHRG = 1V(during

charging) and = 180mV(full

charging)?

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-6

This Document can not be used without Samsung's authorization

U102

2

5

6

3

1

4

4

Q101

3

1

2

5

6

U101

6

DRIVE

2 GND

ISENSE

1

4

PROG

VCC

3

VSENSE

5

VBAT

47K,1%

R131

10UF

C120

10V

1

3

2

Q102

10K,1%

R129

10V

10UF

C119

10K,1%

R130

3K

R132

CHG_DET

TA_VEXT

CHG_ON

TA_VEXT

ICHRG

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-7

This Document can not be used without Samsung's authorization

5. Microphone Part

Is the assembled status

of microphone O.K?

Microphone does not work

C247 = 2.5V

Reassemble the microphone

Solder the microphone again or

Replace C225, R220, C247, R219 R214

END

No

Yes

Yes

Yes

Yes

No

Is microphone ok?

No

Check U200

Check the reference voltage on mic path

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-8

This Document can not be used without Samsung's authorization

EAR_MIC_P

EAR_SPK_P

JACK_IN

NC

R226

6.3V

C250

10U

F

R224

0

R236

0

C261

39PF

0

R237

C251 56PF

R241

200K

10PF

C257

C228

VCCA

150PF

R213

R219

2.2K

10K

ZD411

C245

680

R220

6.3V

10U

F

NC

C243

C248

56PF

39PF

C235

10PF

C229

C246

10PF

R230

10K

0

R217

NC

C249

MAIN_MIC

ICEBERG-FPCB

C255

27PF

15PF

C254

1K

R223

180PF

C260

VCCA

R240

82K,1%

C225

1UF

C226

33PF

ZD404

NC

C256

VCCD

C252

1UF

C258

10PF

330K

ZD410

6.8PF

R242

C259

0

R222

R225

2.2K

R214

270K

3

2

ZD409

Q400

1

33UF

C247

39PF

C253

3

1

100K

R234

CN401

2

6

5

4

JACK_IN

AUXIN

AUXOU

T

MICOUT

MICI

N

EAR_SWITC

H

AOUTBP

AOUTBN

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-9

This Document can not be used without Samsung's authorization

6. Speaker Part

Receiver

Probe power of C262

O.K?

Can not voice from receiver

Cheak power supply

for U200

VCCD,VCCA

O.K?

Check U100

YES

No

Yes

No

Receiver U200

O.K?

Replace Receiver

Receiver U301

Yes

END

No

RECN

RECEIVE R

ZD207

ZD206

RECP

1

1

2

2

10

R251

10

R249

0

R250

AOUTAN

AOUTAP

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-10

This Document can not be used without Samsung's authorization

7. Speaker Part

Loud speaker

Check signals of CN205

O.K

No Melody from Loud Speaker

Check Power of U201

PIN #15,32,6,7

O.K?

Check data lines

of U200

O.K

END

Yes

Replace Speaker

YES

No

Check U100

No

No

Check LCD and Memory

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-11

This Document can not be used without Samsung's authorization

SPEAKE R

6.3V

4.7UF

C209

/IR

Q

3

31

/RD

4

/RST

/WR

28

SPOUT1

17

18

SPOUT2

SPVD D

15

16

SPVSS

VDD

7

VREF

9

8

VSS

29

/CS

14

EQ3

10

HPOUT-L/MONO

HPOUT-R

11

32

IOVDD

2

LE

D

MTR

19

NC

56

PLLC

25 24

D3

D4

23 22

D5

21

D6

20

D7

12

EQ1

EQ2

13

U201

A0

30

1

CLKI

27

D0

D1

26

D2

VCCD

R211

R210

3.3K

C214
100NF

3.3K

C213
100PF

NC

C201

R207
NC

CN205- 1

1

270PF

C206

C202
27PF

6.3V

4.7UF

C218

R205
15K

27PF

C203

22NF

C208

VBAT

100NF

C220

2

NC

C210

33K

1NF

C219

R206

R203

51K

VCCD

100N F

C207

0

R209

DL(0)

A(0)

VIB_EN

DL(7)

DL(6)

DL(5)

DL(4)

DL(3)

DL(2)

DL(1)

CP_WENL

RST

CP_OENL

YMU_IRQ

YMU_EN

YMU_LED

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-12

This Document can not be used without Samsung's authorization

F40 0 CHECK

pin13 ≥ -65dBm ?

8. EGSM Reciever

CONTINUOU S RX ON

RF INPU T : 6 2CH

AM P : -50dBm

NORMAL CONDITION

catch the channel?

U4 01

pin 12 ,13≥

-20 dBm ?

F40 0 CHECK

pin1 , 2 ≥ -65dBm ?

U401 CHECK

pin21,2 2 ≥ -65 dBm ?

U4 03 CHECK

pin 25 ,28 : 3V ?

Check soldere d status of

R40 2

CN4 00

resolder or change

F4 00

resolde r or change

C408 ,C41 0,L402

resolde r or change

U10 0pin33 , C11 8

check or resolder

U403 CHECK

pin 7 : 13 MHz ?

Vp-p : 8 60mV?

OSC400 CHECK

pin 4 : clean 3V ?

U403 change or

resolder

U401 CHECK

pin 1 4,23,2 6,32:

clean 2.8 V?

C4 38,R41 6

resolder

OSC4 00 change or

resolder

U1 00pin33, C11 1

check or resolder

U401 pin3,4

Vp-p : 240 mV?

U4 00 CHECK

pin6, 20 : 2.8 V ?

U40 0

resolder or change

U4 01 pin1, 2

Vp-p : 25 0mV ?

U401

resolder or change

U40 0 pin 2 ,3,4,5
Vp-p : 1 00mV ?

CHECK

U200

NO

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

OSC400 CHECK
pin 3 : 13 MHz ?

Vp-p : 9 50mV?

U10 0pin33 , C11 8

check or resolder

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-13

This Document can not be used without Samsung's authorization

9. EGSM transmitter

F40 0 pin 1 3 :

about 2~3 dBm?

CN400 , C40 6

check&change

F4 00

pin11 : 2 .8 V?

U 200,Q20 3

check & change

Between

C4 29&R406

≒ 4~5dBm?

F400

check & change

C42 0 : 3.7 V?

NO

NO

YES

YES

YES

NO

NO

BATTERY, U1 00

check & change

Between

R410 & U 402 :

1. 2V?

YES

NO

R4 10

check & change

R407 :

≒ -5dBm ?

YES

C42 7 : 3V?

YES

YES

U4 02

change

NO

U2 00

check

U 200

check & change

YES

NO

U401

pin14,2 3,26,3 2 :

2 .8V ?

U10 0pin39,C111

change or re solder

YES

U40 1

pin9 ,10,12 ,13

:-20dBm ?

U40 1

pin5,6 ,7,8 :1.7V ?

YES

U2 00

change

NO

NO

U4 02

change o r resolder

YES

U40 3pin5,25,2 8

: 3V ?

NO

U1 00 pin3 3,C11 8

change or re solder

NO

U40 3

pin 7 : 13MHz?

Vp-p: 95 0mV

YES

U40 3

pin9 ,10,11 ,1213

: 3V?

YES

YES

U4 01

change o r resolder

OSC400

pin 3 : 13MHz?

Vp-p : 950 mV

OSC40 0

change o r resolder

U2 00

check or change

0SC80 1

pin 4 : 3 V ?

U1 00 pin3 3,C11 8

change or re solder

U4 03

change o r resolder

NO

NO

YES

NO

YES

NO

CONTINUS TX ON CONDITION

TX POWER DAC:500 CODE APPLIED

CH:62

RBW : 10 0KHz
VBW : 100KHz
SPAN : 10 MHz

REF LEV. : 10dBm

ATT. : 20 dB

NO

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-14

This Document can not be used without Samsung's authorization

F40 0 CHECK

pin13 ≥ -65dBm ?

10. PCS Reciever

CONTINUOUS RX ON

RF INPUT : 660CH

AMP : -50dBm

NORMAL CONDITION

catch the channel?

Check soldered status of

R402 ,L4 01

U4 01

pin 12 ,13≥

-20 dBm ?

F40 0 CHECK

pin6 ≥ -6 5dBm ?

F40 1 CHECK

pin4,6 ≥ -65dBm ?

U401 CHECK

pin17,1 8 ≥ -65 dBm ?

U4 03 CHECK

pin 25 ,28 : 3V ?

CN40 0

resolder or change

F4 00

reso lder or change

F4 01

reso lder or change

C41 5,U41 5,L404

reso lder or change

U10 0pin33 , C11 8

check or resolder

U403 CHECK

pin 7 : 13 MHz ?

Vp-p : 8 60mV?

OSC400 CHECK

pin 4 : clean 3V ?

U403 change or

resolder

U401 CHECK

pin 1 4,23,2 6,32:

clean 2.8 V?

C439

resolder

OSC4 00 change or

resolder

U1 00pin39, C11 1

check or resolder

U401 pin3,4

Vp-p : 240 mV?

U4 00 CHECK

pin6, 20 : 2.8 V ?

U40 0

resolder or change

U4 01 pin1,2

Vp-p : 25 0mV ?

U401

resolder or change

U40 0 pin 2 ,3,4,5
Vp-p : 1 00mV ?

CHECK

U200

NO

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

OSC400 CHECK
pin 3 : 13 MHz ?

Vp-p : 9 50mV?

NO

U10 0pin33 , C11 8

check or resolder

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-15

This Document can not be used without Samsung's authorization

11. PCS transmitter

F40 0 pin 13 :

about 2~3 dBm?

CN40 0, R40 2

check&change

F4 00

pin9 : 2.8 V?

U 200,Q20 4

check & change

Between

F400&L407 :

≒ 4~5dBm?

F400

check & change

C42 0 : 3.7 V?

NO

NO

YES

YES

YES

NO

NO

BATTERY, U1 00

check & change

Between

R40 8& U402

:1.2V?

YES

NO

R408

check & change

NO

R100 5:

≒ -5dBm ?

YES

C42 7 : 3V?

YES

YES

U4 02

change or re solder

NO

U2 00

check

YES

U2 00

check

NO

U401

pin14,2 3,26,3 2 :

2 .8V ?

U1 00 pin3 9,C11 1

change or re solder

YES

U40 1

pin9 ,10,12 ,13

:-20dBm ?

U40 1

pin5,6 ,7,8 :1.7V ?

YES

U2 00

change

NO

NO

U4 02

change o r resolder

YES

U40 3pin5,25,2 8

: 3V ?

NO

U1 00 pin3 3,C11 8

change or re solder

NO

U40 3

pin 7 : 13MHz?

Vp-p: 95 0mV

YES

U40 3

pin9 ,10,11 ,1213

: 3V?

YES

YES

U4 01

change o r resolder

OSC400

pin 3 : 13MHz?

Vp-p : 950 mV

OSC40 0

change o r resolder

U2 00

check or change

OSC400

pin 4 : 3 V ?

U1 00 pin3 3,C11 8

change or re solder

U4 03

change o r resolder

NO

NO

YES

NO

YES

NO

CONTINUOUS TX ON CONDITION

CH : 698 CH(DCS),660CH(PCS)

TX POWER CODE: 350 CODE Aplied

RBW : 10 0KHz

VBW : 100KHz

SPAN : 10 MHz

REF LEV. : 10dBm

ATT. : 20 dB

SAMSUNG Proprietary-Contents may change without notice

SGH-X105 Flow Chart of Troubleshooting

4-16

This Document can not be used without Samsung's authorization

MICRO STRIP LIN

E

RF314

0

10PF

VOSC

C433

VR

F

C421

6.3V

CN400

G1

3

G2

4

IN

1

OU

T

2

100UF

C435

10N

F

C438

10NF

OSC400

2

GND

3

OUT

VCC

4

VT

1

1.2P

F

270PF

C426

C416

1N

F

C432

22NF

C401

0.75PF

C408

100

R416

10NF

C423

22NF

C424

10PF

C425

TP71

7TP71

8

VRF

TP715

TP716

560

R414

G1

1

G2

3

5

G3

IN

2

OUT1

4

6

OUT2

R415

10

K

F401

VRF

AN

T

1
1

2

2

PCSRX

13

VC1

VC2

11

VC3

5

R402

0

EGSMRX

EGSMRX

2

12

EGSMTX

7

G

G

14

16

G

G

19

20

G

6

F400

ANT

15

DCSRX

3

DCSRX

4

DCS/PCSTX

10

1

NC

R411

100K

R410

22NF

C403

C422

NC

C430

1N

F

C411

22NF

0

R406

NC

C418

NC

C428

2.7nH

L407

NC

C409

L402

27nH

150

C439

10N

F

R412

C429

0.5PF

0.75PF

C410

47PF

C405

C415

1.2PF

30

R407

C404

22NF

C434

1N

F

R417

150

4

OU

T

VC

C

5

VRF

U404

3

GND

2

IN

NC

1

VPAC

VRAM

P

6

5

VREG

VBAT

7

GSM850/900OU

T

9

PCSOUT

11

TXEN

3

VBATT

4

VCC

10
8

VCC2

VCC2

12

U402

BAND

2

1

DCSI

N

GND

13

GSM850/900IN

1.5K

R413

VOSC

C436

1NF

33PF

C406

VOS

C

270

R409

180

R405

R408

270

R404

100PF

C419

180

22NF

C431

20

6.3V

R403

VDDC

7

XI

N

19

XOUT

100UF

C420

RXIP

3

RXQN

RXQP

2

17

SCLK

SD

I

18

15

SD

O

SENB

16

VDDA

20

6

GND

GND

22

GND

23

GND

24

IO

N

12

11

IO

P

PDNB

14

5

RXIN

4

10

CKN

CKP

9

1

GND

8

GND

13

GN

D

21

U400

R401

0

33nH

L406

VOS

C

L404

C437

10NF

6.8nH

VR

F

C440

100PF

3.9nH

L405

VOSC

NC

L401

28

25

VDDR

XI

N

7

VRF

C402

100PF

16

23

RFLO

N

RFLO

P

24

SCLK

12 13

SD

I

SDO

10

11

SENB

5

VDDD

VDD

I

26

27

IFLO

P

NC

8

NC

14

9

PDNB

20

RFL

A

RFL

B

19

RFL

C

17

RFL

D

GND

18

GND

21

GND

GND

22

29

GND

GND

30

3

IFLA

IFLB

2

IFLO

N

U403

1

GND

31

GN

D

GN

D

32

GND

4

GND

6

15

TXIP

TXQ

N

8

7

TXQ

P

23

VDD1

VDD2

14

VDD3

32

VDD4

26

RFIG

P

RFIPN

18

17

RFIPP

RFLON

13

RFLOP

12

RFOD

24

25

RFOG

6

TXIN

5

2

IO

P

29

L1

L2

28

31

PDNB

RFIDN

20

19

RFID

P

RFIG

N

22

21

GND

GND

30

33

GND

GND

34

GND

35

GND

36

10

IFLO

N

IFLO

P

9

IO

N

1

U401

CK

N

3

CK

P

4

DIAG1

16

15

DIAG2

11

GND

27

22NF

C407

10PF

C417

33PF

C427

100PF

C414

DPCS_PAM_IN

GSM_PAM_IN

TX_BAND_SEL

TXPOWER

AF

C

CLK13M_TR

CLK13M_MC

CLK13M_RF

CLK13M_YM

U

TX_EN

PCS_RX_E

N

GSM_TX_EN

DCS_TX_EN

GSM_PAM_IN

DPCS_PAM_IN

SI_EN

SERDAT

SDO

SD

O

SI_E

N

TXIN

TXIP

TXQN

TXQP

SYN_E

N

RXIP

RXI

N

RXQ

P

RXQ

N

CLK13M_RF

SERL

E

SERCLK

SERDAT

SERCL

K

SERL

E