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4. SGH-E400 Flow Chart of Troubleshooting and Circuit Diagrams
1.Baseband
1. Power ON
'Power On' does not
Check the current
consumtion more than
Check the
Vbat(battery+ O )
Voltage more than
Check the pin
15 of U100 is more
than 2.8V
U100 pin 46,39
U100 pin 13
Check the clock signal
pin4 of U800
Freq=13MHz ?
Vrms°√300mV ?
Vpp is around
900mVpp
'Power On' does not
work
100mA
YES
3.3V
YES
YES
= 2.8V
YES
= 1.8V
YES
at
YES
work
END
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NO
Downloader again
NO
Charge the Battery
NO
Check U100 and C113
NO
Check U100 and C116
NO
Check U112
NO
Check the clock generation circuit
(related to OSC801 and U800)
4-1
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