SAMSUNG SGH-R210E
Manual de Servicio

5. Flow Chart of Troubleshooting and Circuit Diagrams
5-1 Power ON

'POWER ON'does not work

Yes
Check the Battery Voltage is more than 3.2V

No
Charge the Battery

Yes
When the "END" key is pressed, the voltage of "D304 pin1" 3.6V?

No
Check the Dome sheet

Yes No
U474 pin 2,3 > 3.2V Check the circuit related to U474

Yes No
U619 pin 5 2.5 V ? Check the circuit related to U619

Yes No
U620 pin 5 3.0 V ? Check U620 and related circuit

Yes No
Check for the clock signal at R107

Check the clock generation circuit (related to U100 and Q100)

Yes
Check the initial operation

END

Flow Chart of Troubleshooting and Circuit Diagrams

5-1