Flow Chart Of Troubleshooting; Baseband; Power On - Samsung SGH-C140i Service Manual

Flow Chart of Troubleshooting

3.
3-

1. Baseband

3-1-1. Power ON

'Power ON' does not work
check the current
consumption
>= 100mA
Check the Voltage
of the Battery
>= 3.3V
Check the pin
C100,C101,C102 of
UCP101 is >= 2.8V
>=2.8V
Check the clock signal
at pin #3 of OSC400
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 OSC400
3-1
No
check keypad
check UCP101 and C101
2
1