Samsung SGH-B7300B, GT-B7300B TSHOO

9. Flow Chart of Troubleshooting

9-1.

Power On

9-1-1.

PDA Part

Insert Power

NG

Check pin2of V_BAT in

U402

is more than

Yes

Check followings

C432 is
C444 is
C440 is

Check C437 is

1.8V

3.0V

3.0V

Yes

3.1V

:

1.2V

No

No

No

Change the Battery&check ZD714

Check the U404

and the related cuircuit

Check the U404

and the related cuircuit

Yes

Check pin1of TR400

Check C445, C431 is

Check pin6of U800 is'H'

Check Other Power Circuit

is'H'

Yes

1.2V

Yes

Yes

No

No

No

Check the UCP800

Check the U404

and the related cuircuit

Check the U800

and the related cuircuit

9-1

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Flow Chart of Troubleshooting

9-2

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Flow Chart of Troubleshooting

9-3

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Flow Chart of Troubleshooting

9-1-2.

Phone Part

Phone Power On'does not work

'

Yes

Check the Battery Voltage

is more than

Check followings

C404 is
C416 is
C426 is

Check C419 is

Yes

2.7V

1.2V

1.8V

Yes

Yes

3.5V

2.6V

No

:

No

No

Change the Battery

Check the U401

and the related cuircuit

Check the U401

Check pin1of

Check C420 is

Check the

TP_TCXO_EN is"H" and

C423 is

Check R408 is'H'

is'H'

U302

Yes

2.6V

Yes

2.85V

Yes

Yes

No

No

No

No

Check the U302 and related circuit

Check the U401

Check the U401

and the related cuircuit

Check the UCP300

and the related cuircuit

Check the initial operation

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9-4

Flow Chart of Troubleshooting

9-5

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Flow Chart of Troubleshooting

9-6

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Flow Chart of Troubleshooting

9-2.

Initial

Initial Failure

Yes

AP_nRST_IN="High"?

at R417

Yes

Check CLK

XTAL_12MHZ_IN/OUT

at R815 OK?

Good

Check the32bit data signal

memory(UCP800)

&

Bad

No

Check the circuit related to reset

Bad

Change UCP301

Replace PBA

END

Good

9-7

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Flow Chart of Troubleshooting

AP_nRST_IN

R422

1

3

4

5

D400

VAP_SYS_3.0V

R417

2

PM_PWR_EN

PWR_I2C_SCL

PWR_I2C_SDA

nBATT_FAULT

C446

R423

PM_SET1
PM_SET2
PM_SET3

PS_HOLD

SW_RST

nPOWER

L403
L404
L405

TP_PS_HOLD

C435

E1

LX1

G2

LX2

G5

LX3

D4

SET1

D3

SET2

D2

SET3

B4

PWREN

E3

PWRON
PWRHOLDF3BUCK3

B5

MR\

C5

ONO\

E4

RSO\

C3

SCL

C2

SDA

B3

SRAD

C4

LBOB

B2

JIGON

A5

REFBP

1

NC

2

NC

U404

VCC_COIN

BUCK1
BUCK2

LDO1
LDO2
LDO3
LDO4
LDO5
LDO6
LDO7
LDO8
LDO9

AGND1
AGND2
PGND1
PGND2
PGND3

F5

F1

IN1

G1

IN2

G6

IN3

A2

IN4

C1

IN5

C6

IN6

E2
F2
F4

F6
B1
A1
A3
A4
A6
B6
D6
E6

D5
E5
D1
G3
G4

9-8

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Flow Chart of Troubleshooting

9-3.

Charging Part

Abnormal charging part

Yes

Check the C433

>4.3V

Yes

Check R415

='L'?

Yes

No

No

Check the circuit related to

VEXT_FET_5V and

Check the circuit related to

TA_nCHG signal

U403

Check the C434 or

U403 pin

≒

END

12

4.2V

Yes

No

Resolder or replace

U403

9-9

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Flow Chart of Troubleshooting

9-10

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Flow Chart of Troubleshooting

9-4.

Sim Part

Phone can't access SIM Card

Yes

C548, C550

After Power ON,

Check SIM_CLK Signal on

pin11 at HDC500

="3.0

Yes

Yes

V"?

No

Check the PMIC(U401)

No

Check the SIM Clock

After SIM card insert,

HDC500 pin

H(SIM_RST)"?

="

Check the SIM Card

13

Yes

Yes

END

No

Resolder HDC500 or replace PBA

9-11

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Flow Chart of Troubleshooting

9-12

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Flow Chart of Troubleshooting

9-5.

Microphone Part

Phone MIC does not work

Check all power source

YES

Check the signal

C521 of U502

OK

related U502

OK

Is MIC working? Replace Mic(MIC500) or PBA

Not OK

Not OK

No

Solder C521, L500 again

esolder orreplace U502

R

END

Yes

9-13

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Flow Chart of Troubleshooting

9-14

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Flow Chart of Troubleshooting

9-15

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Flow Chart of Troubleshooting

9-6.

Speaker Part(Melody)

Speaker does not work

Yes

Check the connection

of HDC500

Yes

Check the signal at

C507, C508 of U501

Yes

Check the signal at

C500, C546, C540 of

HDC500

No

No

No

Replace the Speaker Module

Check all power source

andresolder orreplace U502

andresolder orreplace U501

related U502

Check all power source

related U501

Yes

Does it work?

Yes

END

No

Change the PBA

9-16

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Flow Chart of Troubleshooting

9-17

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Flow Chart of Troubleshooting

9-18

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Flow Chart of Troubleshooting

9-7.

Receiver Part

Receiver does not work

Check the connection

of HDC500

Check the signal at

C541, C543 of HDC500

Does it work?

Yes

Yes

Yes

No

No

No

Replace the Speaker Module

Check all power source

andresolder orreplace U502

related U502

Change the PBA

END

Yes

9-19

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Flow Chart of Troubleshooting

I2S_SCLK

BT_PCM_CLK

CDTI|SDA

CDTO

LIN1||IN1+
LIN2|IN2+
LIN3|IN3+
LIN4|IN4+

LOUT2

RIN1|IN1­RIN2|IN2­RIN4|IN3­RIN4|IN4-

ROUT2

J6
H6
H8
J2

A2
A3
A4
B5

A7
B9
B6

B2
B3
B4
A5

B7
C9

C521

C522

C523
C524

C526

C533
C527

C528

C529

FM_SCL
FM_SDA

MAIN_MIC_P
RADIO_L
SUB_MIC_P
MSM_SPK_P

RCV_P
CODEC_OUT_L
MSM_MIC_P

RADIO_R
SUB_MIC_N
MSM_SPK_N

RCV_N
CODEC_OUT_R

H4

MCKI

J4

MCKO

A1

MDT

B1

MPWR

C8

MUTET

H1

SDTI

J8

SDTIA

G1

SDTIB

H2

SDTO

G9

SDTOA

F2

SDTOB

H9

SYNCA

F1

SYNCB

J3

LRCK

H3

PDN

A9

TEST

CSN|CAD0
CCLK|SCL

LOUT1|RCP

LOUT3|LOP

ROUT1|RCN

9-20

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KEY_MIC_N

Flow Chart of Troubleshooting

9-21

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