Samsung SGH-A200 Service Manual page 31

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5. Flow Chart of Troubleshooting and Circuit Diagram

5-1 Power ON

'POWER ON'does not work

Check the Battery Voltage

between D110 and BAT101 = 3V ?

Check for the clock signal at R301

Check the initial operation

Flow chart of Troubleshooting and Circuit Diagram

Yes

is more than 3.2V

Yes

The node

Yes

U117 pin 1,4,10 > 3.2V

Yes

U463 pin 1, 3 = "H"?

Yes

U463 pin5, 7 = 2.9V ?

Yes

END

Charge the Battery

Check U116 and the path from +VBATT

to BAT101

Check the circuit related to U117

Check the circuit related to U463

Check U463 and related circuit

Check the clock generation circuit

(related to U303 and U301)

5-1

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