Samsung SGH-B520 Troubleshoot

10. Flow Chart of Troubleshooting

10-1.Baseband

10-1-1. Power ON

'Power On' does not work

Check the current consumption

Yes

Current consumption

>= 100mA

Yes

Check the Vbat Voltage

Voltage >=3.3V

Yes

Check the pin of UCP300

Pin#A6 : 1.8V
Pin#D6 : 2.9V

Yes

Pin#M7 : 2.9V

Pin#L8,#P4 : 1.8V

Yes

Check the clock signal at Pin#12(C118) of RFT100

Yes

No

No

No

No

Download again

Charge the Battery

Check UCP300

C332 and C331

Check UCP300

C300,C301,C303

Freq = 26MHz

Vrms >=300mV

Vpp≒900mV

Yes

Check the initial operation

END

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

No

Check the clock generation circuit

(related to OSC100, Pin#9, Pin#10)

10-1

Flow Chart of Troubleshooting

S

D

N

G

2

1

_

_

L

L

P13

USB_CARKIT_D_N

P12

USB_CARKIT_D_P

C10

USB_CHRG

A6

VLDO_1

D6

VLDO_2

E14

VLDO_AUD

F12

VLDO_AUX1

D14

VLDO_AUX2

C15

VLDO_COREA

B15

VLDO_COREA_S

C12

VLDO_COREB

D13

9

0

2

3

3

3

C

C

2

1

3

3

3

3

C

C

VLDO_COREC

L300

C

C

UCP300

3
1
9

C332

3
2
1

C331

C311

C313

S

S

Q

B

D

D

D

D

S

S

S

N

N

N

S

S

S

V

6
K

G

V

G

V

G

1

8

9

1

4

1

F

K

K

K

N

S

S

S

D

D

D

D

D

N

N

N

N

N

G

G

G

G

G

0
1
E

0

7

6

9

8

1

F

F

F

F

F

R331

S

S

D

D

N

N

G

G

C340

1

6

1

G

F

C306

TH300

R303

C305

C320

R306

C308

C307

C323

C309

C

3

0

0

O

S

0
0
3
P
C

U

C

C

3

3

C315

C345C346

0

1

0

6

C
3
1

C301

4

R331

C340

RTX_I_P
RTX_I_N

RTX_Q_P
RTX_Q_N

CLK26M_BT

CLK26M_DBB

C304

SBCK

SBDT

SBLE

VCCD_1.8VVCCD_2.9V VCCA_2.8V

C

C

3

3

2

2

6

5

C

C

3

3

2

2

7

8

C300

A4

ADC_AUX1

B4

ADC_AUX2

B3

ADC_AUX3

A2

ADC_AUX4

B1

ADC_AUX5

C1

ADC_AUX6

C2

C301

5

4

2

7

2

1

1

1

1

K

N

M

D

C

N

C

A

B

D

D

D

1

B

D

D

D

D

1

D

V

V

V

D

D

D

V

V

D
V

UCP300

C112

C118

C302

0

5

1

5

4

8

1

1

1

L

P

K

L

P

N

L

V

R

D

O

O

I

I

T

D

K

D

_

_

C

D

P

D

D

D

O

V

S

V

D

D

A

D

V

V

_

D

D

V

D
V

C
N

1

A

2

AX

3

B

4

BX

5

VDD1

6

FSYS3

7

FSYS2

8

VDD2

9

XO

10

XOX

C303

C309

5

6

1

2

F

C

D

D

X

X

D

D

E

N

N
G

RFT100

D
N
G

1
1

N

D

R

G

V

R

1

3

S

D

K

Y

L

D

S

C

V

F

3

2

1

1

26

T

T

D

VDD4

V

25

RX1X

24

RX1

23

RX2X

22

RX2

21

GND

20

RX3X

19

RX3

18

RX4X

17

RX4

A

N

D

E

4

6

5

1

1

1

VRF_1.5V

GSM
GSM

DCS_

DCS_

C119

C

C

4

3

1

2

2

9

C

C

C

3

4

3

2

1

3

4

4

0

C
1
1
2

OSC100

R409R410

C
4
1
1

C345C346

R
1
0
1

C101

R

R

4

4

0

0

1

3

C
4
0
7

C402

C

R

4

4

0

0

3

6

0
0
3
P
C
U

C315

C
3
1
4

R
1
2
2

R413

C425

C

R

C

4
0

4

2

0
9

C
4
2
4

C318

C

C

3

3

0

1

0

6

C301

C
1
0
2

C317

C302

C303

R

C

4

4

4

2

1

2

7

7

2

C

C

R

4

4

4

2

2

1
4

6

9

R238

VR200

R251

R267

R
F

T
1
0
0

C120

C116

C115

C113

L
1
0
6

L
1
0
5

C11 8 C119

10-2

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

10-1-2. Initial

Flow Chart of Troubleshooting

Initial Failure

Yes

The Pin#A6 of UCP300 =

1.8V and

the Pin#D6 of UCP300 =

2.9V ?

Yes

Is the RST Pin#P5 of

UCP300 "Low→High" ?

Yes

There is 32.768kHz wave

forms at the C345 and C346

of OSC300

Is the SIM_RST Pin #B5 of

UCP300 is "High"

-

Yes

?

No

No

No

No

(if it has some problem, it is to be replaced.)

(if it has some problem, it is to be replaced.)

Check the

Check the

Check the

Check the

UCP300

UCP300

UCP300

UCP300

Yes

The voltage is "High" at the

C300,C301,C302,C303

Yes

LCD display is O.K

Yes

Sound is O.K

Yes

END

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

No

No

No

10-3

Check the

Check the

Check the

UCP300

LCD

AUDIO

part

part

Flow Chart of Troubleshooting

0

4

9

L301

SIM_CLK

SIM_RST

UP_CLK

UP_RST

VRFLDO_1

VRFLDO_2

CNTL_DAT_CSP

CNTL_EN_CSP

HV_CHRG

BATKELV

PSW1_BUF

RTC_CLK

SCUSTB

SCANTST

RING_DRV

VIB_DRV

VIB_RNG_EN

SYSCLK

SYSCLKEN

RESETN

RESET_O

VAMICREF

VAMICRTN

VAREFRTN

VAVCMLSH

VAVCMRTN

CSN_PSC

SCLK_PSC

SDI_PSC

SDO_PSC

VBAT12

VBATAUD

VBATAUX

VBATRF

VBATSW

SIM_IO

X1RTC

X2RTC

VAREF

VAVCM

C311

C307

DCDC_OUT

GND_SW

VSIM

V_BATT

VRF_2.9V

C320

C313

C308

C309

C321

L301

V_BATT

C322

C346

OSC300

4

1

C345

2

3

B6

E6

B5

N5

L6

UP_IO

M6

E3

F3

F2

VREF

P1

N9

D10

G5

AFC

N7

AINT

B11

F1

CREF

L9

DINT

B12

FBSW

B13

LX

D3

NC1

L10

R3

P3

C9

VACC

A12

VEXT

F5

VRTC

C5

VSIM

N4

SCAN

K7

E8

E9

L7

N6

R6

R4

P5

G4

G3

K13

K10

K12

J11

L14

F13

K11

M10

P10

R10

M9

B10

VBAT

C6

E13

E11

E2

A14

1

NC

2

NC

L300

SIM1_CLK
SIM1_DATA
SIM1_RST

CNTL_DAT_CSP
CNTL_EN_CSP

AINT

DINT

PSW1_BUF
RTC_CLK
SCUSTB

MOTOR_EN
VIB_RNG_EN

CLK26M_ABB
CLK_REQ_ABB

FLASH_RST
RST

VAMICREF

C317

C318

UP_CS
UP_SCLK
UP_SDI
UP_SDO

C323

SIM_CLK
SIM_IO
SIM_RST

V_BATT

C324

VSYN_2.8V

C306

C310

C319

C
3
0
4

C310

L300

C

C

3

3

1

2

9

1

C313

TH300

R331

C340

C306

R303

C305

C320

C332

C331

C311

R306

C308

C307

C
3
2
7

C323

GND_SW

C

C

C

3

3

2

3

8

0

C

3

4

2

1

4

4

R

C
4
1
1

C

4

4

0

0

6

3

C318

C
4
2
4

C3

C3

0
0
3
P
C

U

C

C
3

C309

S

3

C

0

0

O

C345C346

C315

3

0

1

0

6

C
3
1

C301

10-4

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

10-1-3. Sim Part

"Insert SIM is displayed on the LCD

Flow Chart of Troubleshooting

Yes

Check the SIM connector's

(SIM600) connection to

SIM card

Yes

Check the voltage at Pin#1

of SIM600 >= 2.9V ?

Yes

Is there any signals

Pin#13,#15,#16 of SIM600 ?

Yes

Check the SIM Card

END

No

No

No

Resolder or change

Check the

UCP300

Check the

SIM600

UCP300

VSIM
SIM_RST
SIM_CLK

C636

C635

C634

SIM600

6

11

33 4

7

C633 C634C632

C635

99

6

5

5

22

4

12 12

7
88

1111

10 10

G

G

1314GG1516

SIM_IO

C636

10-5

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

C
6
3
2

SIM600

Flow Chart of Troubleshooting

10-1-4. Microphone Part

Microphone does not work

Yes

Is the assembled status of

microphone O.K?

Yes

Check the reference voltage on mic path

Yes

R402≒2.4V ?

Yes

Is microphone ok?

Yes

END

C402

MONO1_IN_P

C414

C403

C407

C412

R406

C411

R403

R409

R410

No

No

No

Reassembled the microphone

Resolder or change

R401,R402,C409

Check

UCP300

R401

MIC+

MIC-MONO1_IN_N

R402

VAMICREF

C409

MIC+
MIC-

VR400

R
4

R409R410

0
3

C

C

C
3
2
9

C
3
3
0

4

4

0

1

7

2

C402

R

C

C

C

4

4

3

4

0

1

2

1

6

4

4

1

0
0
3
P
C
U

L403

VR401

L404

MIC400

*

C
3
2
5

C
3
2
8

10-6

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

R

R413

4
0

R

C318

C

C

4

4

0

2

4

2

2

0
9

R

C

4

4

1

2

4

4

C317

C302

C303

1

C
4
0
3

10-1-5. Receiver/Speaker Part

There is no sound from the Receiver/Speaker

Yes

Flow Chart of Troubleshooting

Is the terminal of

Receiver/Speaker O.K ?

Yes

Is SPK&MOT FPCB and

SUB PBA Connection O.K?

Yes

Is there any signals at the

Pin#5 and Pin#6 of CN102?

Yes

Is there any signals at the

Pin#3 and Pin#4 of CN100

Yes

Is there any signals at the

Pin#3 and Pin#4 of HDC600

Yes

No

No

No

No

No

Replace the SPK&MOT FPCB

Check SUB PBA AND

SPK&MOT FPCB Connection

Check

CN102(SUB PBA)

Resolder

(OR

Replace the SLIDE FPCB

Check

HDC600, U400(Audio AMP)

(OR

R431, R432 - Receiver.

C405, C406 - Speaker)

Resolder

L104, L105)

L408, L409,

Is there any signals at the

Pin#R13,Pin#R14,

Pin#12, Pin#P11

of UCP300 ?

Yes

END

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

No

10-7

Check

UCP300

Flow Chart of Troubleshooting

MOTOR_EN

SPK+
SPK-

SPK_P

LCD_ID

D(5)
D(3)
D(1)

CP_OEN

CP_WEN

MEM_RST

D(7)

PWR_ON
KEY_COL(2)
KEY_COL(1)
KEY_COL(0)

V_BATT

MOTOR

3

C106

1

2

0

0

1

1

D

D

Z

Z

R603

C604 C602

C610

C605

D100

2

1

V101

L104

SPEAKER

ZD601

ZD600

ZD602

L105

ZD603

ZD604 ZD606

ZD605

VCCD_1.8V

C608

CN102

1

1

2

2

3

3

4

4

5

5

6

6

7

NC

8

NC

C607

SPK+

LCD_ID

LCD_D(5)
LCD_D(3)
LCD_D(1)

LCD_RD
LCD_WE
LCD_RST
LCD_D(7)

PWR_ON
KEY_COL(2)
KEY_COL(1)
KEY_COL(0)

1

2

1

3

4

3

56

6

5
778

9

10

9

11 12

11

12

13 14

13

14

15

16

15

17 18

17

18

19

20

19
212122

23 24

23

24

252526

27 28

27

28

29

30

29
313132
333334

NCNC

35

36

2
4

8
10

16

20
22

26

30
32
34

V_BATT

VCCD_2.9V

C631

C613

C606 C617

2
4

8

10

16
18
20
22

26
28
30
32
34

CN100

ZD607

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34

NCNC36NC
35

37 38

ZD609ZD608

1

1

3

3

56

5

7

7

9

9

1112

11

1314

13

15

15

17

17

19

19

21

21

2324

23

25

25

27

27

29

29

31

31

33

33

NC

HDC600

VCCD_1.8V

V_BATT

ZD611ZD610

ZD612

VCCD_2.9V

C103

C611

C637

C102C104

R614

C601

SPK­LCD_BL_EN

LCD_D(6)
LCD_D(4)
LCD_D(2)
LCD_D(0)
LCD_RS
LCD_CS
MOTOR_EN
KEY_SLIDE_EN
KEY_ROW(3)
KEY_ROW(4)
KEY_COL(3)

SPK_N
LCD_BL_EN

D(6)
D(4)
D(2)
D(0)
A(2)
LCD_CS
MOTOR_EN
KEY_SLIDE_EN
KEY_ROW(3)
KEY_ROW(4)
KEY_COL(3)

C619C600

LCD CON

V

V
1
0
7

L103

1

0

4

CN102

U100

C100

R101

ZD101

L105

L104

ZD102

C

V

D

1

1

1

0

0

0

6

1

0

C

C

1

1

C

0

0

7

1

1

C

0

V

1

1

3

1

0

2

9

L101

C
N
1

0
0

C114

V103

V100

CN101

C
1
0
2

V

L

C

V

1

1

1

1

0

0

1

0

2

5

5

8

C104

R108

TP100

L100

C113

10-8

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization