Samsung E715 Service Manual Trouble Shooting

2. SGH-E715 Flow Chart of Troubleshooting

1. Power ON

'Power ON' Does not work

Check the current consumption

Current consumption

≥100mA ?

YES

Check the V bat. voltage

Voltage ≥ 3.3V ?

YES

Check the pin of U100

pin #11 ≥ 2.8V ?

YES

pin #39 and #33 = 2.8V

NO

NO

NO

NO

Down load again

Charge the Battery

Check U100 and C110

YES

Check the clock signal
at pin #3 of OSC400

Freq.=13MHz,Vrms 300mV

YES

Check the Initial operation

END

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Pin #9=1.8V?

YES

NO

2-1

NO

Check U100 and C109

Check the clock generation

circuit (OSC400, U402 pin#4)

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

2. System Initial

Initial Failure

The pin #9 of U100 = 1.8V
and pin #11 of U100=2.8V?

YES

Is the pin #19 of U100

" Low --> High" ?

YES

There is 32.768KHz wave
form at the C324, C325 ?

YES

Is the pin #25 of U100

is High ?

NO

NO

NO

NO

Check the U100
(If it has some problem,
it has to be replaced.)

Check the U100
(If it has some problem,
it has to be replaced.)

Check the U303

Check the U300

YES

The voltage is "High"
at the C106,C112,C113 ?

YES

LCD Display OK ?

YES

Sound operation OK ?

YES

END

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NO

NO

NO

2-2

Check the U100

Check the LCD part

Check the Audio part

3. SIM Part

"Insert SIM" is displayed on the LCD

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

Is there any signal

pin #52,53,54 of U100 ?

YES

Is there any signal

pin #1,2,3,6 of CN100 ?

YES

Check the SIM Card

NO

Check the U303

NO

Check the U100

END

2-3

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SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

4. Charging Part

Abnormal charging operation

The pin #17,18 of CN101

(VEXT) is 5V ?

YES

The pin#2 of U102 is Low?

YES

The pin#3 of U102 is Low?

YES

The pin#5 of U101 is

3.2~4.2V?

NO

NO

NO

NO

Replace TA or check CN101

Check the U102

Check the U102

Check the U101

YES

The ICHRG =1V(during charging)

&180mV(fullcharging)?

YES

END

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2-4

NO

Solder again or change

R119

RTCALAR M
PWR_KEEP

KEY_COL(2)

KEY_ROW(0)

TA_VEXT

CHG_DET

PWR_O N

JIG_ON

3

2

VRTC

R11 0
390K

Q102

DTC144EM

C103
470N F

C105
100N F

1

Q100

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

CN100

1

4

1

4

2

5

2

5

6

3

3

6

G

G

GG

7

89

54
53
52

44
45

56

3
2

1
43

46
47

13
21
20

14
15

16
17
18

22
23
24
25
26
27

55
57

58
59
60

C117
10UF
10V

10

49

UP_RST
UP_CLK
UP_IO

ADC_AUX1
ADC_AUX2
ADC_TRIG

VACC
VBA T

VEXT
BTEM P

PWR_SW1N
PWR_SW 2
RTC_ALM N
PWR_KEEP
PSW1_BUF
INTRQ
SDI
SDO
SCLK
CSN

EN_3
EN_4[0]
EN_4[1]
EN_5
EN_5A
EN_5B

RING_PW M

GN D
GN D
GN D
GNDD

D
N
G

2

1
6

6

D
N
G

3
6

C102

C101

33PF

33PF

SIMRST
SIMCLK

SIMDATA

VBAT

TA_VEXT

R114

UP_SDI

330K

UP_SCLK

UP_CS

EN_VRF

EN_VPAC

XOEN A

R118

CHG_O N

10K,1%

1

3

2

C100
33PF

C104
100NF

30

48

50

51

T

K

I

M

O

S

L

I

S

_

R

C

V

_

_

M

I

M

M

I

I

S

S

S

U100

R

V

V

D

R

_

D

G

_

D

D

N

B

N

N

I

I
V

R

G

G

4

5

4
6

U103

1

2

3

6

28

29

F

F

1

Q

E

E

D

D

R

R

D

N

V

C

N

G

VLDO_7

G

VDD67

VLDO_6

VL5S_A
VL5S_B

VLDO_5

VDD5

VL4S_A
VL4S_B

VLDO_4

VDD34

VLDO_3

VRTC

VLDO_2

RESETN

VLDO_1

VDD12

V

V

R

R

D

D

_

_
1
D
E
L

78

1

2

6

5

4

2
D
E
L

ISENSE

GND

VCC

U101

D
N
G

5

6

6

6

DRIVE

VSENSE

PRO G

R120

47K,1%

D

D

D

N

N

N

G

G

G

8

7

6

6

BACKLIGHT2
BACKLIGHT1

6

5

4 3

VBA T

VREF

40

41

42

32
31

33

34

36
35

37

38

39

12

11

19

9

10

C107

10U F

10V

Q101

6
5
2

4

1

3

TA_VEXT

R121
3K

C108

470NF

C109

2.2UF

R119

10K,1%

VBAT

VCC D VCC_1.8A

VRF

C110

2.2U F

C116
10U F
10V

C106

2.2U F

ICHRG

VPAC

C111

2.2U F

VOSC

C112

2.2U F

VCC A

10U F

C113

VCC B

C114

2.2U F

10V

C115
100PF

VRTC

S
O
P

G

E
N

R115

1.2K

1

2

RST

M1

2-5

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5. Microphone Part

Micro-phone does not work

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

Is the assembled status of

Microphone O.K?

YES

Check the DC bias voltage on

Mic path.

The voltage of C237 is

2.2V±10%?

YES

Is microphone OK?

NO

NO

NO

Reassemble the microphone

Solder the microphone again

or Replace

C230,C237,R217,R218,R219

Check U300

YES

END

2-6

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SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

6. Speaker Part

There is no sound from speaker

Is the terminal of speaker

is O.K?

YES

Are there any signal

at the pin #40,42 of CN200?

YES

YES

Are there any signal

at the pin #5,7 of U201?

NO

NO

Thetypeofsoundfrom

the speaker is Melody?

NO NO

Replace the speaker

Check the LCD module

& Replace CN200

NO

Are there any signal

at the pin #3,9 of U201?

YES

Pin #4 of U201

is Low?

YES

Check U202

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NO

Check
U201,
U303

END

2-7

YES

NO

Pin #4 of U201

is High?

YES

Check U300

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

1
0
2
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3

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2

1

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5

2-8

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7. Camera Part

Camera function does not work

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

Check the connect CN200?

YES

Pin #9 of U203 = 2.8V?

YES

Pin #10 of U203 = 2.8V?

YES

Pin#3 of OSC200 is 25MHz?

YES

NO

NO

NO

NO

Connect the CN200

Check the U203

YES

Pin #2 of U203 = High?

Pin#1 of OSC200 = High?

YES

NO

NO

Check
U303

Check
U200

Pin#54 of CN200 is High?

END

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Replace the OSC200

NO

Check solder status of

R207, C208

2-9

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

8. EGSM Receiver

Continuous RX ON

RF Input : 62 CH

AMP : -50dBm

NORMAL CONDITION

Catch the channel ?

YES

F400 Check

Pin #6 ≥ -65dBm ?

YES

F400 Check

Pin #11 ≥ -65dBm ?

YES

F403 Check

Pin #1 ≥ -65dBm ?

YES

U401 Check

Pin#20,21 ≥ -65dBm ?

YES

NO

NO

NO

NO

NO

Check soldered status of

C400,402

CN400

Resolder or Change

F400 Resolder or Change

Check soldered status of

F400 Resolder or Change

Check soldered status of

L410 &

C415,417,L406,F403

U401 Check

Pin#9,32=Clean 2.8V?

YES

U401 Check

Pin#28,1,2,3=100mV?

YES

Check U300

NO

U100,C106,C112

Check or resolder

NO

U401 Check

Pin #8 : 13MHz ?

Vpp : 860mV?

NO

OSC400 Check

Pin #8 : 13MHz ?

Vpp : 950mV?

NO

YES YES YES

U401

Change or resolder

2-10

R412,C426

resolder

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OSC400 Check
Pin #4 = 2.8V ?

OSC400

Change or resolder

NO

9. EGSM Transmitter

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

F400 Pin#6

About 2~3 dBm?

YES

C402,CN400

Check & Change

U400 Pin #6 is

YES

About -5 dBm?

NO

NO

C403

=3.7V?

YES

Level of

1.2V?

YES

U400 pin#7

NO

F400

Pin#10 = High?

Level of

F400 Pin#7 is

4~5dBm ?

F400

Check & Change

NO

NO

YES

YES

Check the

Battery Block

Check

&ChangeR406

OK ?

YES

NO

Check & Change

U300,301

NO

Continuous TX ON condition

TX Power Code : 500 code Applied

U300

Check & Change

CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB

NO

U400 pin#3

High ?

YES

Change U400

U401 Check

Pin#9,32 ≥ 2.8V ?

YES

U401 Check

Pin #8 : 13MHz ?

Vpp : 860mV?

YES

U401 Pin

#4,5,6,7 = 1.7V?

YES

Change U400Check U300

NO

Check U300

NO

NO NO

U100,C106,C112

Check or resolder

OSC400 Check

Pin #8 : 13MHz ?

Vpp : 950mV?

YES YES

R412,C426

resolder

OSC400 Check
Pin #4 = 2.8V ?

OSC400

Change or resolder

NO

2-11

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SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

10. PCS Receiver

Continuous RX ON

RF Input : 660 CH

AMP : -50dBm

NORMAL CONDITION

Catch the channel ?

YES

F400 Check

Pin #6 ≥ -65dBm ?

YES

F400 Check

Pin #3 ≥ -65dBm ?

YES

F401 Check

Pin #1 ≥ -65dBm ?

YES

U401 Check

Pin#16,17 ≥ -65dBm ?

YES

NO

NO

NO

NO

NO

Check soldered status of

C400,402

CN400

Resolder or Change

F400 Resolder or Change

Check soldered status of

L408,C429

Check soldered status of

C405,406,L402,F401

U401 Check

Pin#9,32=Clean 2.8V?

YES

U401 Check

Pin#28,1,2,3=100mV?

YES

Check U300

NO

U100,C106,C112

Check or resolder

NO

U401 Check

Pin #8 : 13MHz ?

Vpp : 860mV?

NO

OSC400 Check

Pin #8 : 13MHz ?

Vpp : 950mV?

NO

YES YES YES

U401

Change or resolder

2-12

R412,C426

resolder

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OSC400 Check
Pin #4 = 2.8V ?

OSC400

Change or resolder

NO

11. PCS Transmitter

SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

F400 Pin#6

About 2~3 dBm?

YES

C402,CN400

Check & Change

U400 Pin #6 is

YES

About -5 dBm?

NO

NO

C403

=3.7V?

YES

Level of

1.2V?

YES

U400 pin#1

NO

F400

Pin#4 = High?

Level of

F400 Pin#5 is

4~5dBm ?

F400,L403,C413

Check & Change

NO

NO

YES

YES

Check the

Battery Block

Check

&ChangeR406

OK ?

YES

NO

Check & Change

U300,302

NO

Continuous TX ON condition

TX Power Code : 350 code Applied

U300

Check & Change

CH : 660
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB

NO

Check U300

U400 pin#3

High ?

YES

Change U400

U401 Check

Pin#9,32 ≥ 2.8V ?

YES

U401 Check

Pin #8 : 13MHz ?

Vpp : 860mV?

YES

U401 Pin

#4,5,6,7 = 1.7V?

YES

Change U400

NO

Check U300

NO

NO NO

U100,C106,C112

Check or resolder

OSC400 Check

Pin #8 : 13MHz ?

Vpp : 950mV?

YES

R412,C426

resolder

OSC400 Check
Pin #4 = 2.8V ?

YES

OSC400

Change or resolder

NO

2-13

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SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams

N

P

P

N

P

I

I

Q

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2-14

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