Samsung SGH-F860V, Руководство по обслуживанию

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Mobilchips
2. SGH-E860V
Flow Chart of Troubleshooting
2- 29
2-1 BASEBAND
2-1-1. Power ON
check the current
consumption
>= 100mA
Download again
'Power ON' does not work
No
Yes
Yes
END
Yes
Check the Initial Operation
Check U401 , C421
Yes
Yes
C419,C420
>= 2.8V
No
C421=1.8V ?
No
Yes
Charge the battery
No
Check the Voltage
of the Battery
>= 3.3V
check keypad
No
Check the pin C417
of U401 is
>=1.8V
Check
"Power On"
key?
No
check U401 and C417
Yes
Check the clock signal at
pin #4 of OSC100
Freq=13Mhz,
Vrms >=300mV
No
Check the clock generation
circuit OSC100
Yes