Samsung E2121b Troubleshooting 6

9. Flow Chart of Troubleshooting

Power On

9-1.

OWER ON' does not work

'P

Yes

Check battery voltage

is higher than

Check VPERM_3.0V,

VANA_2.85V, VRF_2.85V,

VSIM_3.0V, VMEM_1.8V,

VGPIO_2.8V of UCP201

Check the pin1of

OSC201 produces clock

signal

Check the L118

concerning about Jig

Power on

3.3V

OK

OK

OK

Not OK

NotOK

Not OK

Not OK

Change battery

Check the UCP201

older OSC201 again

S

older L118 again

S

OK

No

Is Power On working?

Yes

END

Repeat sequence

9-1

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Flow Chart of Troubleshooting

UCP201

PNX4852

FE_CTRL2

FE_CTRL3

PCM_DO

PCM_DI

PCM_CLK

PCM_SYNC

PMU_VIO

PMU_VANA

PMU_VMEM

PMU_VPERM

PMU_VRF

PMU_VSIM

POK_IN

POK_OUT

PWM_OUT0

PWM_OUT1

PWM_OUT2

ICHGN

RFID_N

RFID_P

RFIE_N

RFIE_P

RFIP_N

RFIP_P

UART0_RD

UART0_TD

UART1_RD

UART1_TD

UART1_CTS

UART1_RTS

XTAL_26M_1

XTAL_26M_2

XTAL_32K_1

XTAL_32K_2

XTAL_SHLD

XTAL_SHLD

XTAL_SHLD

XTAL_SHLD

XTAL_SHLD

XTAL_SHLD

SIM_CLK

ICHGP

K15

L15

H16

H15

J19

J18

W15

W14

V15

L201

W12

W13

V14

T8

V8

T7

T5

T6

W8

W9

E1

D1

G1

F1

C1

B1

A1

RFOH

A2

RFOL

L18

K18

W5

V5

V7

W6

A7

A6

L19

K19

A5

B8

B7

B6

B5

A8

H19

H18

1
2

PON_PA

MOD_STANDBY

DD
DU
DCL
FSC

VGPIO_2.8V
VANA_2.85V

VMEM_1.8V
VPERM_3.0V
VRF_2.85V
VSIM_3.0V

ONKEY_2

ONKEY_1

ICHGN
ICHGP

DCSRX_N
DCSRX_P
EGSMRX_N
EGSMRX_P

DCS_TX
EGSM_TX

UART0_TD
UART0_RD

UART1_RD
UART1_TD

OSC201

3

SIM_CLK

OSC200

2

3
4

1

IFC100

HY20-AB0310

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

12

12

13

13

14

14

15

15

16

16

17

17

18

18

19

19

20

20

21

NC

22

NC

23

NC

24

NC

25

NC

26

NC

27

NC

VBAT

VCHG_5V

R137
R138
R139

EAR_SW_REF

C133

R117

C132

C134

C136

C135

C137

U313

L111
L113

R122

L115
L116

R123

L117D

JIG_ON_IF

R125
R126

L118

D

R120

R_ANT

EAR_N
VCM_OUT
EAR_P
EAR_SW

AUX_DET
UART0_TD
UART0_RD

JIG_ON

R119

VDD_AIT_3.3V

R124

3

2
S

3
D

U314

G
1

USB_EN

USB_DP
USB_DM

EAR_MIC

EAR_MIC_P

EAR_MIC_N

R128

C150

6

5

4

3

5

4

6

2

1

ZD104

2

3

ZD105

C147 C149

1

C148

9-2

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Flow Chart of Troubleshooting

9-3

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This Document can not be used without Samsung's authorization

Flow Chart of Troubleshooting

9-2. S

IM Part

Insert SIM" is displayed on the LCD

"

VSIM_3.0V at the pin#1

SIM

200 = "

Is there any signal pin

#2,3,4

Yes

of SIM

Yes

H"?

201?

No

No

Check the SIM Power

Check UCP201

Check the SIM Card

END

9-4

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SIM_DATA

Flow Chart of Troubleshooting

VSIM_3.0V

R213

SIM201

SIM_RST

SIM_CLK

C233

C234

C232

1
2
3

7

7

88

99

G

11 11

G
1314GG1516

6
5

4

1212

1010

9-5

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Flow Chart of Troubleshooting

Microphone Part-Phone MIC

9-3.

Phone MIC does not work

Yes

Check the connection

of MIC

OK

Check thecomponents

which are connected to

MIC_BIAS

OK

Check the circuit

of MIC PART

OK

Is Phone MIC working?

Not OK

Not OK

Not OK

No

older MIC again

S

Solder R118, R132, C141, C145 and

older L108, R131, ZD100 and ZD103

S

C142 again

again.

Replace MIC

Yes

END

9-6

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MIC_BIAS

Flow Chart of Troubleshooting

MIC100

0
0
1
D
Z

3
0
1
D
Z

L108

R131

0ohm

C142

R118

R132

C141

C145

C140

MIC_P

R130

MIC_N

C146

MAIN_MIC

9-7

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Flow Chart of Troubleshooting

Earphone MIC does not work

Microphone Part-Earphone MIC

9-4.

Yes

Check the connection

of IFC100

OK

Check MIC_BIAS.

When UCP201 operates

(

and call is connected

OK

Check the circuit

of EAR MIC

OK

Is Earphone MIC working?

)

Not OK

Not OK

Not OK

No

older pin3of IFC100 again

S

Solder R118, R132, C141, C145 and

older L111, L113 and R120 again

S

C142 again

Repeat the sequence

Yes

END

9-8

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IFC100

HY20-AB0310

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

12

12

13

13

14

14

15

15

16

16

17

17

18

18

19

19

20

20

21

NC

22

NC

23

NC

24

NC

25

NC

26

NC

27

NC

Flow Chart of Troubleshooting

EAR_SW_REF

C133

R117

VBAT

VCHG_5V

L111
L113

R122

L115
L116
L117

R123

JIG_ON_IF

L118

R125
R126

TA_DETECT

1005

R129

5

6

R120

1

3

4

6

2

ZD104

R_ANT

C150

C147

C149

1

3

4

5

2

ZD105

C136

R119

C138

EAR_N
VCM_OUT
EAR_P
EAR_SW

AUX_DET
UART0_TD
UART0_RD

JIG_ON

C148

VDD_3.3V

R124

0
0
1
Q

3

D

C132

C134

C137

2

S

G
1

R128

EAR_MIC_P

C135

EAR_MIC_N

C139

USB_EN

USB_DP
USB_DM

MIC100

0
0
1

L108

D
Z

R131

0ohm

3
0
1
D
Z

MAIN_MIC

MIC_BIAS

C142

R118

R132

C141

C145

C140

MIC_P

R130

MIC_N

C146

9-9

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Flow Chart of Troubleshooting

9-10

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This Document can not be used without Samsung's authorization

Earphone Part

9-5.

Flow Chart of Troubleshooting

Earphone does not work

Yes

Check the circuit

of IFC100

OK

Check the UCP201
Pin R19, T19, P19

Yes

END

Not OK

Not OK

older pin

S

L115, L116 and L117 again

,

Solder UCP201 or replace UCP201

5,6,7

of IFC100

9-11

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