Samsung SGH-E2550L Troubleshooting

9. Flow Chart of Troubleshooting

Baseband

9-1.

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 UCP200

C246(VISA)=

>= 100

mA

Yes

>=3.4V

Yes

2.5

Yes

V?

No

No

No

Download again

Charge the Battery

Check UCP200

C246

G11,G12(VDD_GSM_C

ORE)

Check the clock signal at OSC of PNX6608

Check the clock

Freq

Check the initial operation

=1.2

= 32.768k

Yes

END

V?

Yes

Hz

Yes

No

No

Check UCP200

C224

Check the clock generation circuit

relatedtoOSC2

(

C241, C242

00,

)

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.

Initial

Initial Failure

Yes

Is the RST Pin#A10(RSTON)

UCP200"Low→High"

of

Yes

The Pin

N8,N9,N10,N11(VBAT)

#

of PM300

There is

forms at the C241 and C242

>= 3.4V

Yes

kHz wave

32.768

of OSC200

No

?

No

-

No

Check the UCP200

if it has some problems,replace it

(

Check the UCP200

if it has some problems,replace it

(

Check the UCP200

.)

.)

Yes

The voltage is"High" at the

C215,C223

Yes

LCD display is O.K

Yes

Sound is O.K

Yes

END

No

No

No

Check the UCP200

Check the LCD part

Check the AUDIO part

9-4

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Flow Chart of Troubleshooting

9-5

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Flow Chart of Troubleshooting

9-6

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Flow Chart of Troubleshooting

9-1-3.

Sim Part

Insert SIM is displayed on the LCD

"

Yes

SIM200 PIN#1

After Power On,

Check SIMCLK Signal On

PIN#3 of SIM200 inafew

After SIM Card insert,

SIM200 PIN#2="H"

=H?

Yes

second

Yes

No

No

No

Resolder or change UCP200

Check the clock

Replace PBA

Yes

Check the SIM Card

END

9-7

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