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