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