Samsung SGH-S7550B TSHOO

Flow Chart of Troubleshooting

9.

Power On

9-1

Power On" does not work

"

Battery Voltage

Current consumption

100mA?

Check PMIC output voltage

C403

=1.2V,

C422

Check the oscillator clock

TCX100(C183)

OSC400(

=2.8V,

C413

=1.8V,

C409

=1.2V,

C423

R307)=32

≥

YES

=3.0V,

C421

=2.9V,

YES

=26

Khz,OK?

3.3V?

≥

C411

=3.0V,

OK?

Mhz

NO

,

Download again and check main key con.

NO

Change the Battery

Check the U400

check the TCX100, OSC400

YES

END

9-1

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Flow Chart of Troubleshooting

9-2

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9-2.

Sim Part

"

Flow Chart of Troubleshooting

No SIM mode" is displayed on the LCD

Check the pad condition of SIM Card

Check the SIM

connector's(SIM100)

connection to SIM card

YES

Check the voltage

C106

Is there any signals

pin#2,#3,#4 of SIM1

=3.0V,

END

OK?

YES

00?

YES

NO

Resolder or Replace SIM100

Check the U400

Check the UCP300

9-3

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Flow Chart of Troubleshooting

9-4

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Audio Part-Main&Sub MIC

9-3.

Phone MIC does not work

Flow Chart of Troubleshooting

Check the connection of

MIC(MIC100-normal,

MIC500-loud)

YES

Check the voltage

C527(MIC_BIAS)=

Check the components which

are connected to MIC_BIAS

R502,R503,R504,R506,R507)

(

Check the circuit

of MIC PATH

L3,L4,L500,L501,L503,L504,

(

C534,C535)

YES

2.2V,

OK?

NO

Resolder or Replace MIC(MIC100, MIC500)

Check the UCP300

Resolder R502,R503,R504,R506,R507

Resolder L3,L4,L500,L501,L503,L504,C534,C535

YES

END

9-5

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Flow Chart of Troubleshooting

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9-6

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Microphone Part-Earphone MIC

9-4.

Earphone MIC does not work

Flow Chart of Troubleshooting

Is the Headset O.K?

YES

Check the voltage at

C527(MIC_BIAS=

Check the components

which are connected to

EARMIC_BIAS(R500,R501

Check the circuit

of EARMIC

PATH(L502,C514,C517

2.2V)?

YES

NO

)

NO

)

Change the Headset

Check the UCP300

Resolder R500,R501

Check the Ear path

Check the voltage at

C609

(=1.1V)

YES

Check the IFC600

YES

END

NO

Check the U600

Replace IFC600

9-7

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Flow Chart of Troubleshooting

_

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A

9-8

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Earphone Part

9-5.

Flow Chart of Troubleshooting

Earphone is not work

Is the Headset O.K?

YES

Check the components

which are connected to

R508,R600,R601,C503,C504,

(

Earphone

L602,L603

Is there any signals at

C503,C504

Is there any signals at

L602,L603

)

YES

?

YES

?

YES

NO

Change the Headset

Resolder R508,R600,R601,C503,C504,L602,L603

Resolder or Replace U502

Resolder or Replace U600

Is there any signals at

Pin#1,#2 of IFC600

YES

Check the voltage at

C415

(=3.0V)

YES

END

?

NO

Resolder or Replace IFC600

Check the PM400

9-9

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Flow Chart of Troubleshooting

9-10

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Charging Part

9-6.

Flow Chart of Troubleshooting

Charging does not work

Check the Battery&TA

YES

Is the voltage of C602

YES

Is the voltage of C408

YES

Is charging working?

YES

END

?

5.0V?

NO

Reinsert the Battery&TA

Check the IFC600

Check the U600

Check the Q400 or Replace the PM400

9-11

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Flow Chart of Troubleshooting

9-12

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Speaker Part

9-7.

Flow Chart of Troubleshooting

Speaker does not work

Is the terminal of Speaker

Check the components which are connected to

Speaker(L1,L2,C503,C504

Is there any signals at

O.K

?

YES

Check the voltage at

C415

(=3.0V)

YES

C503,C504

?

YES

NO

)

NO

Replace the Speaker

Check the PM400

Resolder L1,L2,C503,C504

Resolder or Replace U502,UCP300

Is there any signals at

C817,C818

Is there any signals at

Pin#10,#11 of HDC800?

?

YES

END

NO

Resolder or Replace U600

Resolder or Replace HDC800

9-13

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Flow Chart of Troubleshooting

9-14

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Receiver Part

9-8.

Flow Chart of Troubleshooting

Receiver does not work

Is the terminal of Receiver

Check the components

which are connected to

Is there any signals at

O.K

?

YES

Receiver(L700,L701

YES

UCP300

?

YES

Pin#23#24 HDC702

YES

)

NO

Replace the Receiver

Resolder L700,L701

Resolder or Replace UCP300

Resolder or Replace HDC702

END

9-15

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Flow Chart of Troubleshooting

9-16

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Flow Chart of Troubleshooting

9-9.

Camera

Camera does not work

YES

Check camera connector

YES

Check F705 and F706

YES

Check Camera supply voltage.

C701=

replace the Camera module

2.8V,

C709=

C707=

2.8V.

YES

.

?

1.8V,

NO

.

Reconnect the Camera FPCB

Check the U700, U701

Resolder or replace F705,F706

.

END

9-17

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Flow Chart of Troubleshooting

9-18

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