Samsung E760 Service Manual Trouble Shooting

7. Flow Chart of Troubleshooting

7-1. Power On

' Power On ' does not work

Yes

Check the Battery Voltage

is more than 3.4V

Yes

C424(+VDD_IO_LOW) &

C423(+VDD_IO_HIGH) = "H"?

Yes

Check the Clock at

R402=32KHZ

Yes

C400(+VDD_GSM_CORE)

=1.8V?

No

Change the Battery

No

Change the PMU (U400)

No

Resolder OSC400

No

Check the +VDD_GSM_CORE circuit

Yes

Check for the clock at C303

= 26MHz

Yes

Check the initial operation

Yes

END

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

No

7-1

Check the clock generation circuit

(related to U100)

Flow Chart of Troubleshooting

VDD_IO_LOW

VDD_4V

VDD_CORE_BT

VDD_SLEEP 2.9V

1.8V

4V

MIC_BIAS

IT_PMU

SIMIO

RSTON

VDD_IO_HIGH

AVDD_HFA

AVDD

VCC_RX_TX

VCC_SYN

VDD_GSM_CORE

1.8V

2.9V

2.6V

2.8V

1.8V

2.6V

2.8V

+VDD_IO_LOW

+VDD_IO_HIGH

+AVDD_HFA

vcc

+VDD_G_A

+AVDD

+VDD_RX_TX

+VCC_SYN

VBAT

ONKEYN

DC/DC Down Conveter(1.8Volt)

V400

REF_ON

VBAT

L400

C403

C424

R409

C423

C422

M

I

B

S

C

A

12

R

C

_

H

T

S

11

I

Q

_

R

10

I

C

H

O

I

S

M

9

I

S

K

M

C

H

8

S

M

R

_

C

I

H

S

7

W

E

R

P

1

N

6

W

E

R

P

2

N

5

K

L

C

2

3

K

4

A

D

S

3

L

C

S

2

R

_

1

C

E

1

NC 54

C415

C421

13

15

14

_REC2

IOD2VBAT

IOVDD

GPO147GPO2

GND

NC 53

49

50

51

52

48

C414

C413

23

21

22

18

17

16

HCVBAT

HCVDD

D2VDD

_SIMRSCD

SIMEN

GPO3

44

45

46

C416

C417

24

20

19

RF12VBAT

D1VDD

RF1VDD

RF2VDD

LPD1VBAT

LPVDD

C

S

O

25

S

O

I

C

26

K

N

O

_

Y

E

27

R

C

F

E

28

T

I

V

N

29

V

A

S

E

30

V

T

A

U400

SIMCKCD

B

31

H

C

V

G

32

G

H

C

V

R

D

33

C

G

H

C

/

T

R

A

U

B

X

M

A

SIMIOCD

42

43

34

V

P

C

D

35

B

T

A

V

P

C

36

SIMD3VBAT

SIMVCC

D3VDD

SCN

SCP

40

41

38

37

39

C412

CLOSE_THE_I/ O PIN

C409

C411

4

V

1

0

1

A

T

A

0

4

0

B

4

R

4

0

+VDD_IO_LOW

C406

C408

R402

C

S

0

O

0

4

C

-

V

T

7

2

1

C404

C405

C407

BU_RST

R401

5

61

4

MODE

VFB

VIN

U401

GND

RUN

SW

2

3

L401

C402

R400

C400

C401

+VDD_GSM_CORE

+VDD_IO_LOW

C420

C418

C419

SIM_CLK

SIM_RST

10

9

6

7

NC8NC

NC

VCC

I/O

NC

SIM400

PON_TX

REF_ON

SIMCLK

SCL

SIMRST

AUX_ON

32KHz_DIGIT

SDA

VDD_SLEEP

SIM_VCC

SIM_IO

1

2

5

3

4

VCC

RST

CLK

GND

7-2

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-3

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-2. Initial

Initial Failure

Yes

Check the Battery Voltage

is more than 3.4V

Yes

U200 pin 12 (RSTON)="H"

Yes

Check U405 pin 4 : 32MHz

Yes

Is U200 R203, R204

OK?

Yes

No

Change the Battery

Change the PMU

Check the circuit related to reset

Check the U200

Check the 16bit data signal

Yes

END

7-4

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-5

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-3. Charging Part

Abnormal charging part

Yes

Check the U503 pin 1

>4.9V

Yes

U503 pin 5 = "L"?

Yes

U503 pin 3 = "L"?

Yes

Check the U503 pin 10

≒4.2V

No

Check the circuit related to

V_EXT_CHARGE

Resolder or replace U503

Check the circuit related to

AUX_ON signal

Resolder or replace U503

Yes

END

7-6

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

+VDD_IO_HIGH

Flow Chart of Troubleshooting

V_EXT_CHARGE

R511

U503

GND

BAT

ICDL

GND

USBON

IMIN

10

9

8

7

6

R513

R514

1

CRDL

2

C507

USB

3

_PPR

4

_CHG

5

_EN

11

+VBUS

C504C503

ZD501

AUX_ON

END_OF_CHG USB_CHG_ON

CHG_ON

C501

VBAT

ZD500

BATTERY CHARGING

7-7

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-4. Sim Part

Phone can't access SIM Card

SIM400 pin 1,5 = "H"?

Yes

No

Check the sim charge pump

Yes

After SIM c a rd insert,

SIM400 pin 2 = "H(SIM_RST)"?

Yes

After Power ON,

Check SIMCLK Signal on

pin3 of SIM400 in a few

Yes

Check the SIM Card

Yes

END

No

Replace PBA

No

Check the Clock

7-8

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

SDA

32KHz_DIGIT

SIMRST

REF_ON

SCL

AUX_ON

SIM400

NC8NC

VCC

1

VDD_SLEEP

NC

RST

VCC

CLK

GND

I/O

NC

9

2

5

3

4

6

7

10

SIM_IO

SIM_RST

SIM_CLK

SIM_VCC

C419

C418

C420

SIMCLK

PON_TX

CLOSE_THE_I/ O PIN

C412

+VDD_IO_LOW

BU_RST

C407

C405

C404

B

0

4

A

0

T

4

0

R

40

42

41

39

38

37

SCP

SCN

D3VDD

SIMVCC

SIMD3VBAT

36

P

A

T

V

C

B

35

P

D

V

C

D

34

C

R

G

/

B

A

C

U

H

33

R

V

G

D

C

H

32

H

G

V

C

31

T

V

B

A

30

V

S

E

A

29

T

V

N

I

28

C

R

E

F

27

E

O

Y

_

N

K

26

O

I

S

C

25

O

S

C

RF12VBAT

D1VDD

RF1VDD

RF2VDD

23

21

22

24

C417

C416

46

49

50

51

52

48

44

45

43

GPO3

SIMEN

SIMIOCD

SIMCKCD

_SIMRSCD

A

X

T

M

U400

HCVBAT

HCVDD15IOD2VBAT

LPD1VBAT

LPVDD

16

18

17

20

19

53

54

NC

GND

GPO147GPO2

1

E

_

C

1

R

2

S

C

L

3

S

D

A

4

3

2

K

C

L

5

E

P

N

2

W

R

6

E

P

N

1

W

R

7

R

_

S

M

I

C

S

H

8

S

H

C

K

M

C

I

9

S

M

I

O

I

H

C

10

Q

_

R

I

11

C

S

_

T

H

R

12

B

I

A

S

C

M

I

_REC2

D2VDD

IOVDD

13

14

C422

1

2

7

1

V

C

A

C

T

-

O

4

S

0

C

0

R402

C406

ONKEYN

4

V

0

1

C408

C409

V400

VBAT

C411

+VDD_RX_TX

C413

+VCC_SYN

C414

+VDD_G_A

C415

+AVDD

C421

+AVDD_HFA

C423

vcc

+VDD_IO_HIGH

C424

+VDD_IO_LOW

R409

RSTON

SIMIO

IT_PMU

MIC_BIAS

7-9

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-10

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

7-5. Microphone Part

Microphone does not work

Check the connection from

MIC,

Yes

No

Resolder MIC

Yes

Check the circuit

from U200 to MIC

Yes

Check CN601, PIN 8

='H'?

Yes

Check the MIC

Yes

END

No

Resolder the

(C600, R603, R607, C603, C608)

Check the JACK_EN signal

Replace the MIC

7-11

SAMSUNG Proprietary-Contents may change without notice

This Document can not be used without Samsung's authorization