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4. SGH-X400 Flow Chart of Troubleshooting
4-
1
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1. Power On
Check the current
consumption more
than 100mA
'Power On' does not work
Check the Voltage
more than 3.3V
Download again
Charge the Battery
Check the pin
11 of U102 is
more than 2.8V
Check U102 and C117
U102 pin 39,33
= 2.8V
Check U102 and C116
Check the clock
signal at pin3 of
OSC801
Freq=13MHz ?
Vrms≥300mV ?
Vpp is around
900mVpp ?
Check the clock generation
circuit
(related to OSC801)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
U102 pin 9
= 1.8V
No
Yes
