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Flow Chart of Troubleshooting
2. SGH-X461
2-
1. Baseband
2-1-1. Power ON
'Power ON' does not work
check the current
consumption
>= 100mA
Check the Voltage
of the Battery
>= 3.3V
Check the pin C212,
C213,C214, C215
of U200 is
>=2.8V
Check the clock signal at
pin #1 of U802
Freq=26Mhz,
Vrms >=300mV
Check the Initial Operation
END
Yes
Yes
No
Yes
Yes
Yes
No
Download again
No
Charge the battery
Check
"Power On"
key?
Yes
Check the clock generation
No
circuit U802
2-1
No
check keypad
check
U100
and
C100
2
1
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