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7. SGH-N620E Flow Chart of Troubleshooting
1. Power On
' Power On ' does not work
Check the Battery Voltage
is more than 3.2V?
WHen the "END" key is
pressed, the voltage of
"D104" pin is 3.6V?
U102 pin 10
U103 pin 5 ≠ 2.5V
U101 pin 5 ≠ 3.3V
U102 pin 3 ≠ 3.0V
Check for the clock signal at
R320
Check the initial operation
Yes
Yes
Yes
Yes
Yes
END
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No
Change the Battery
No
Check the Dome sheet
No
Check the circuit related to
U102,U103
No
Check U101, U102 and related circuit
No
Check the clock generation circuit
(related to OSC301 and Q304)
7-1
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