01_Troubleshooting.pdf

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2. SGH-X461
Flow Chart of Troubleshooting
2-
1. Baseband
2-1-1. Power ON
'Power ON' does not work
check the current
consumption
>= 100mA
Yes
No
Download again
Check the Voltage
of the Battery
>= 3.3V
Yes
No
Charge the battery
Check the pin C212,
C213,C214, C215
of U200 is
>=2.8V
Yes
No
Check
"Power On"
key?
Yes
No
check keypad
1
check
U100
and
C100
Check the clock signal at
pin #1 of U802
Freq=26Mhz,
Vrms >=300mV
No
Check the clock generation
circuit U802
2
Yes
Check the Initial Operation
Yes
END
2-1
SGH-X461 Flow Chart of Troubleshooting
2-2
SGH-X461 Flow Chart of Troubleshooting
2-1-2. Initial
Initial Failure
check the pin
RSTB of U600 is
LOW?
Yes
No
Check U600
1
check the pin CKI
of U600 is 13Mhz?
Yes
No
Check
R801,R802,C813,C815
2
Check the clock signal
at pin #3 of U802
Freq=26Mhz?
No
check
U802
3
Yes
Check the pin #9 of U600
is HIGH and pin #11,
#13 is 2.9V?
No
Check U100
4
Yes
Check the Initial Operation
Yes
END
2-3
SGH-X461 Flow Chart of Troubleshooting
2-4
SGH-X461 Flow Chart of Troubleshooting
2-1-3. Sim Part
"Insert SIM" is displayed on the LCD
The voltage is 2.8V
at the pin#1 of CN100
Yes
No
Check the
U100
1
Is there any signal
pin #2,3,4 of CN100?
No
Check the
U100 & U600
2
Yes
Check the SIM Card
END
2-5

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