Samsung B7620 Troubleshooting

Flow Chart of TroubleShooting

9.

9-1.

Power On

Check the current consumption

Check consumption

Check the voltage

Power On

'

>100

TA801



mA

Yes

>3.1V

'

No

Binary Download

No

Check the battery

Yes

Check the voltage of C451

C451

=3.0V

Yes

Check the initial operation

Yes

END

No

Check the C451, TA801

D401, R426, R427&R428

9-1

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VF

VOVP_5.0V

ZD801

R426

D801

IF_CON_SENSE_USB

VREG_MSMP_2.6V

R427

TA801

VBAT

R428

BTC801

1

1

2

2

3

3

4

NC

5

NC

6

NC

7

NC

D401

1

3

4

2

5

LX1

LX2

LX3

SET1

SET2

SET3

PWREN

PWRON

PWRHOLD BUCK3

MR\

ONO\

RSO\

SCL

SDA

SRAD

LBOB

JIGON

REFBP

U408

F5

VCC_COIN

F1

IN1

G1

IN2

G6

IN3

A2

IN4

C1

IN5

C6

IN6

E2

BUCK1

F2

BUCK2

F4

F6

LDO1

B1

LDO2

A1

LDO3

A3

LDO4

A4

LDO5

A6

LDO6

LDO6

B6

LDO7

D6

LDO8

E6

LDO9

D5

AGND1

E5

AGND2

D1

PGND1

G3

PGND2

G4

PGND3

VALIVE_1.2V_S3C VSD_VCC_3VVOTGI_1.2V_S3C VOTG_3.3V_S3C

LDO1

LDO2

5
0
0
1

C443

VMOVI_3V

LDO3

LDO4

LDO5

C444

C445

C456

VKEY_LED_3.3V

LDO7

C447

VCC_3.0V_PDAVRTC_3.0V_S3C

AP_N_RST_IN

VIBTONE_EN

LDO8

LDO9

C451

C450C449

Flow Chart of Troubleshooting

9-2.

initial

Initail Failure

'

TP_PS_HOLD=3.0V

Check the Frequency

R429

= 32.768

C629

=12

'

Yes

Yes

KHz

Yes

MHz

No

No

No

Check UAP601&U410

Check OSC302

Check OSC601

Yes

LCD Display OK?

Yes

Sound operation OK?

Yes

END

No

Check LCD part

No

Check Speaker part

9-3

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VCC_3.0V_PDA

PS_HOLD

AP_N_RST_IN

VCOIN_3.0V

C342

U410

C
N

11

VCC

VCC

OUT

C
N

62

5

4

12

7

G

1

INA

2

GND

3

INB OUTY

OSC302

1

VIO

C
N

C
N

34

C

C

C

C

N

N

N

N

5

89

10

R436

AP_PS_HOLD

XTAL_12MHZ_IN

XTAL_12MHZ_OUT

R635

1

4

1
0
6

C
S
O

3

2

C628

C629

Flow Chart of Troubleshooting

9-3.

T-flash

Initail Failure

'

T-Flash Breakdown

Voltage of C458

There is any signal at

Pin6in T/SIM801

'

NG

No

<3V

No

Yes

Yes

Change T-Flash

Yes

Check U411

No

Check T/SIM801, ZD802&ZD803

Replace T/SIM801

9-5

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VBAT VREG_RFRX1_2.1V

VREG_USIM_3.0V

VCOIN_3.0V

R439

SD_DAT2_OUT
SD_DAT3_OUT

SD_CMDOUT

SD_CLKOUT

SD_DAT0_OUT
SD_DAT1_OUT

SIM_RST
SIM_CLK

SIM_IO

SD_DET

2

6

D

B

M

M

I

R

S

T

V

V

VCC_3.0V_PDA

R803

OUT1

OUT2

OUT3

OUT4

OUT5

C403

6

1

R408

A6

A5

A7

C7

LDO4

B2

VTFLASH_3V

C801

R807

R806R802 R804

R805

5

4

5

4

3

O

O

O

I

I

I

ZD803

D

2

1

N

O

O

G

I

I

2

3

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

T/SIM801

DAT2
CD|DAT3
CMD
VDD
CLK
VSS
DAT0
DAT1
VCC
RST
CLK
RESERVED
GND
VPP
I|O
RESERVED
SW
COMMON
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC

C465

2

7

1

B

C

G

T

S

N
I

T

U

O

A

B

C

B

V

V

A1

IN1

F1

IN2

A4

H5

6

5

5

4

O

O

I

I

ZD802

D

1

N
O
I

G

1

2

U402

IN3

IN4

VREG_USIM_3.0V

R801

4

3
O

I

2
O

I

3

C802

TFLASH_EN

VBAT

C457

4

VDD1VOUT

3

CE

U411

VTFLASH_3V

2

D

GND

N
G

5

C458

Flow Chart of Troubleshooting

9-4.

SIM

Insert SIM card

SIM CARD Breakdown

No

Voltage of C403

There is any signal at

Pin11in T/SIM801

Replace T/SIM801

<3V

No

Yes

Yes

Change SIM CARD

Yes

Check U402

No

Check T/SIM801, ZD802&ZD803

9-7

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VBAT VREG_RFRX1_2.1V

VREG_USIM_3.0V

VCOIN_3.0V

R439

C465

2

7

1

B

C

G

T

S

T

U

A

B

B

V

A1

IN1

F1

IN2

A4

H5

U402

IN3

IN4

C403

R408

2

6

D

B

N

M

M

I

I

R

S

O

T

V

C

V

V

A6

OUT1

A5

OUT2

A7

OUT3

C7

LDO4

OUT4

B2

OUT5

VREG_USIM_3.0V

VTFLASH_3V

VCC_3.0V_PDA

C801

SD_DAT2_OUT
SD_DAT3_OUT

SD_CMDOUT

SD_CLKOUT

SD_DAT0_OUT
SD_DAT1_OUT

SIM_RST

SIM_CLK

SIM_IO

SD_DET

6

1

5
O

I

ZD802

1
O

I

R801

R803

R805

R807

R806R802 R804

T/SIM801

1

DAT2

2

CD|DAT3

3

CMD

4

VDD

5

CLK

6

VSS

7

DAT0

8

DAT1

9

VCC

10

RST

11

CLK

12

RESERVED

13

GND

14

VPP

15

I|O

16

RESERVED

17

SW

18

COMMON

19

NC

20

NC

21

NC

4

5

4

3

4

O

O

I

I

6

5

3

5

4

O

O

O

I

I

I

ZD803

D

2

N

O

G

I

2

3

C802

D

2

1

N

O

O

I

G

1

I

2

3

22

NC

23

NC

24

NC

25

NC

26

NC

27

NC

28

NC

29

NC

30

NC

31

NC

32

NC

Flow Chart of Troubleshooting

9-5.

Charging

Abnormal Charging operation

Yes

Check IFC801's pin

is about5Vwhen charging

Check U401's pin

is about5Vwhen charging

#1

Yes

#11

Yes

No

Check the TA

No

Check the U802

Check U401's pin

is"LOW" when charging

#4, #11

Yes

END

No

Check the U401

9-9

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TA_ISET

CHG_EN

12

VUSB_5.0V

10

11

T

N

I

U
O
E

F
A
S

U401

N
E
_

5

4

C413

G
H
C

_

MIN

BATT

_ABO

K

D

O

N

P
_

G

6

VOVP_5.0V

13

GND

14

NC

15

R407

VF

TP_CHG

NC

1

SETI

2

DETBAT

3

ABI

9

8

7

VCC_3.0V_PDA

R404

VBAT

CHG_ING_N

R409

R410

C461

Flow Chart of Troubleshooting

9-6.

Bluetooth

Check the connection disable

Yes

Check BT Activation

Yes

Check U202's pin

pin

#39 (1.8

Yes

#15 (

V)

Vbat),

No

Enable BT Function

No

Check the U202

Check BT ANT

Yes

Exchange BT Module(U202)

Yes

END

No

ANT203 reassemble change

9-11

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ANT203

34

12

L204

BT_PCM_DO

BT_PCM_DI

BT_PCM_CLK

BT_PCM_SYNC

BT_EN

COMBO_38.4M_CLK

CLK32K_COMBO18

C224

C216

TP213

28

27

26

29

25

12

6

3

1

2

4

5

13

38

40

41

42

43

44

R207

AUD_IN

AUD_OUT

AUD_CLK

AUD_FSYNC

BT_EN

BT_DBG

FAST_CLK

SLOW_CLK_IN

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

NC

D
N
G

7

VBAT

L208

C214

5

3

1

2

T

T

A

N

B

A

V

U202

D

D

D

D

D

D

D

D

D

N

N

N

N

G

G

G

G

2

4

1

4

9

2

2

2

1

1

D

N

N

N

N

N

N

G

G

G

G

G

G

9

8

7

6

0

5

4

4

4

4

5

4

D

D

D

D

D
N
G

1
5

D

D

N

N

N

N

N

N

G

G

G

G

G

G

2

5

4

6

3

5

5

5

5

5

C215

C217

10

HCI_RX

9

HCI_TX

11

HCI_CTS

8

HCI_RTS

SDIO_D1

SDIO_D2

SDIO_D3|SPI_CS

WL_RS232_RX

WL_RS232_TX

WLAN_EN

WLAN_DBG

WLAN_IRQ

CLK_REQ

D

D

N

N

G

G

3

2

4

6

6

6

35

34

33

32

37

36

30

TP218

31

TP219

20

16

TP221

17

18

39

VIO

D
N
G

SDIO_D0|SPI_DOUT

SDIO_CLK|SPI_CLK

SDIO_CMD|SPI_DIN

D

D

D

D

D

N

N

N

N

N

G

G

G

G

G

8

7

1

0

9

5

5

6

6

5

BT_UART_TXD
BT_UART_RXD
BT_UART_RTS
BT_UART_CTS

WLAN_SDIO_D0
WLAN_SDIO_D1
WLAN_SDIO_D2
WLAN_SDIO_D3
WLAN_SDIO_CLK
WLAN_SDIO_CMD

WLAN_EN

WLAN_IRQ

CLK_REQ

VCC_1.8V_PDA

L209

R208

C219

Flow Chart of Troubleshooting

VCOMBO_1.8V

COMBO_38.4M_CLK

CLK_REQ

C212

VBAT

R206

C222

R205

OUT

GND

U204

VDD4VOUT

3

CE

3

OSC201

2

D
N
G

5

4

VDD

SW

1

GND

C211

VCOMBO_1.8V

VCOMBO_1.8V

1

2

C223

9-13

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Flow Chart of Troubleshooting

9-7.

RECEIVER Working

Recieve does not work

Is there any signal at

C518,C522?

Yes

Is there any siganl at

C730, C731?

Yes

No

Check UCP301

No

Check U502

Is the assemble status if

slide FPCB connector OK?

Yes

Is the assemble status of

receiver OK?

Yes

END

No

Replace slide FPCB connector

No

Resolder or change receiver

9-14

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Flow Chart of Troubleshooting

R503

R504

C509 C510

C511

CLK19.2M_CODEC

AP_I2S_DO

BT_PCM30_DI

AP_I2S_DI

BT_PCM30_DO

BT_PCM30_SYNC

AP_I2S_SYNC

AUDIO_EN

C512

R502

C524

VCC_3.0V_PDA

VCC_3.0V_PDA

C503

C501

8

9

9
E

D

D

3

T

C

M

D

B

O

O

D

C

C

C

V

O

V

V

T

C
V

D1

SAIN1

C2

SAIN2

C1

SAIN3

I2C

MCKI
MCKO
MDT
MPWR
MUTET

SDTI
SDTIA
SDTIB

SDTO
SDTOA
SDTOB

SYNCA
SYNCB

LRCK
PDN
TEST

U502

C

C

C

N

N

N

3

1

2

C

H5

H4
J4
A1
B1
C8

H1
J8
G1

H2
G9
F2

H9
F1

J3
H3
A9

2
E

2
D
D
V
T

4
S
S
V

2

8
F

D

D

D

D

D

V

V

P

A
S

LOUT1|RCP

LOUT3|LOP

ROUT1|RCN

ROUT3|LON

3

2

S

S

S

S

V

V

7

1
E

H

8

7
J

E

D

D

D

D

V

V

D

A

GPIO1

GPO2

BICK
BICKA
BICKB

CSN|CAD0
CCLK|SCL

CDTI|SDA

CDTO

LIN1||IN1+

LIN2|IN2+
LIN3|IN3+
LIN4|IN4+

LOUT2

RIN1|IN1­RIN2|IN2­RIN4|IN3­RIN4|IN4-

ROUT2

1
S
S
V

8

9
F

B

TA501

C504

8
A

J1
J9

J5
G8
G2

J6
H6
H8
J2

A2
A3
A4
B5

A7
B9
B6

B2
B3
B4
A5

B7
C9
A6

C515
C517
C518

C520
C521
C522

AP_I2S_CLK
BT_PCM30_CLK

AUDIO_SCL
AUDIO_SDA

MIC_P
RADIO_L
EAR_MIC_P
CP_RCV_P

RCV_P
CODEC_OUT_L
CODEC_MIC+

MIC_N
RADIO_R
EAR_MIC_N
CP_RCV_N

RCV_N
CODEC_OUT_R
CODEC_MIC-

CODEC_OUT_L

CODEC_OUT_R

AUDIO_SDA
AUDIO_SCL

C534

C536

TA503

C535

C537

C539

C529

1

5

B

C

D
D
V

RXIN­RXIN+

INA1
INA2

INB1
INB2

BIAS
SDA
SCL

U503

D
N
G

3
D

P

S
S
V

3

4

A

C

D4
B4

D2
D1

C2
C1

B2
B3
C3

D
D
V

OUT-

OUT+

HPR

HPL

C1N
C1P

D
N
G
P

C530

D5

R517

B5

R519

A1
A2

A4
A5

1

NC

2

NC

C538

C540

C543

C544 C542C541

9-15

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SPK_N
SPK_P

EARSPK_R
EARSPK_L

Flow Chart of Troubleshooting

9-8.

SPEAKER Working

Speaker does not work

Is the assemble ststus of

speaker module OK?

Yes

Is there any signal at

C534,C535?

Yes

Replace speaker module connector

No

Change speaker module

No

or

Check U502

Is there ant signal at C543,

C544?

Yes

END

No

Check U503

9-16

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