Samsung SGH-C3050, GT-C3050-SM TSHOO

9. Flow Chart of Troubleshooting

9-1-1.

Power ON

Power On' does not work

'

Check the current consumption

Yes

Current consumption

Check the Vbat Voltage

Voltage

Check the pin of UCD3

>= 100

Pin#A6 Pin#D6

mA

Yes

>=3.3V

Yes

:1.8V :2.9V

No

00

No

Check UCD300and

Download again

Charge the Battery

C339,

C340

in#L8

≒

=1.8V

=26 >=300

1000

END

Yes

=2.9V

Yes

MHz

mV

Yes

Pin#M7

P

Check the clock signal at pin#12of RFT100

Freq

Vrms

Vpp

Check the initial operation

No

Yes

No

Check UCD300 and

C301,C303

C300,

Check the clock generation circuit

related to OSC100,Pin9,Pin10,

(

)

9-1

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Flow Chart of Troubleshooting

9-2

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Flow Chart of Troubleshooting

9-1-2.

Initial

Initial Failure

Yes

The pin#A6 of UCD3

1.8V

the pin#D6 ofUCD3

2.9V ?

Is the pin#P5 of UCD300

Low→High"

"

00 =

and

00 =

Yes

?

Yes

No

if it has some problem, it is to be replaced.)

(

if it has some problem, it is to be replaced.)

(

Check the UCD300

There is

forms at the

The voltage is"High" at the

C300,

LCD display is O.K

Sound is O.K

kHz wave

32.768

and

C324

Yes

C301,C302,C303

Yes

END

C325

No

Check the UCD300

Check the LCD part

Check the Audio part

9-3

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Flow Chart of Troubleshooting

9-4

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Flow Chart of Troubleshooting

9-1-3.

Sim Part

"

Insert SIM is displayed on the LCD

Yes

Check the SIM connector's

SIM

(

Check the voltage at pin#1

pin#2,#3,#4 of SIM

connection to

500) SIM card

Yes

of SIM

500 >= 2.9V ?

Yes

Is there any signals

500 ?

No

Resolder or change SIM

Check the UCD300

Check the UCD3

500

00

Yes

Check the SIM Card

END

9-5

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Flow Chart of Troubleshooting

9-6

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Flow Chart of Troubleshooting

9-1-4.

Microphone Part

Microphone does not work

Is the assembled status of

microphone O.K?

Check the reference voltage on mic path

VAMICREF

between MIC+&MIC-

Yes

On booting,

≒

Yes

On booting,

Yes

END

2.5V ?

≒

1.9V?

No

Reassembled the microphone

Check UCD300

Resolder or change

C417, L403, C421, L404, R415, C420

C419, C426, C418, ZD602, ZD604

9-7

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Flow Chart of Troubleshooting

9-8

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Flow Chart of Troubleshooting

9-1-5.

Receiver Part

There is no sound from the Receiver

Is the terminal of Receiver

Is there any signals at the

O.K

?

R410 and R411

Yes

L401 and L402

Yes

No

?

No

?

Replace the Receiver

CheckUCD300,R410, R411

Check

U400,

L401, L402

Check Camera/SPK/Motor FPCB.

END

9-9

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This Document can not be used without Samsung's authorization