Samsung SGH-S200 Troubleshooting

6. S GH -S2 00 Flow Chart o f Troublesho oti ng

1. Power On

' Power On ' does not work

Check the current consumption

Current consumption >=100mA

Yes

Check the V bat. Voltage

Voltage >= 3.3V

Yes

Check the pin of U100

pin#15 >= 2.8 V

Yes

pin#46 and pin#39 = 2.8V

Yes

No

No

No

No

pin#13 = 1.8V

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Charge the Battery

Check U100 a nd C113

No

Check U100 and C112

Check the clock signal at

pin4 of OSC801
Freq = 13MHz ,
Vrms ≥ 300mV and

Vpp ㆃ 900mVpp

Yes

Check the initial operation

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Yes

No

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Check the clock generation circuit

(related to OSC 801, U901 pin 19)

SGH-S200 Flow Chart of Troubleshooting

2. Initial

Initializatio n Failure

Yes

The pin #13 of U100 = 1.8V an d

the pin #15 of U100 ㆃ 2.825V ?

Yes

Is the pin #28 of U1 00

"Low -> High"?

Yes

There is 32.768kHz wave forms

at the C615 and C616

Yes

Yes

No

No

No

No

(If it has some problem, it has to be replaced.)

(If it has some pr oblem, it has to be replaced.)

Check the U100

Check the U100

Check the U601

Check the U700The pin #22 of U100 is "High"

The Voltage is "High" at the

C112, C113, C116

Yes

LCD display is O.K

Yes

Sound is O.K

Yes

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No

Check the U100

No

Check the LCD Part

No

Check the Audio Part

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3. Sim Part

"Insert SIM" is displayed on the LCD

Yes

Is there any Signals

pin#64, #65, #66 of U100?

Yes

Is there any Signals

pin#1, #2, #3, #4 o f CN 100?

SGH-S200 Flow Chart of Troubleshooting

No

Check the U601

No

Check the U100

Yes

Check the SIM Card

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6-3

SGH-S200 Flow Chart of Troubleshooting

4. Charging Part

Abnormal charging operation

The pin #17, #18 of CN300

is TA_VEXT ㆃ 5V?

Yes

The pin #3 of U1 01 is "low"?

Yes

The pin #3 of Q101 is "low "?

Yes

The pin #5 of U101 is 3 .2~4.2V"? Check the U101

No

Replace TA or Check CN300

No

Check the U101

No

Check the Q101

No

Yes

No

The ICHRG = 1V(during charging)

and ㆃ 180mV(full charging)?

Yes

END

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6-4

Solder again or change R111

SGH-S200 Flow Chart of Troubleshooting

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6-5