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5.Flow Chart of Troubleshooting and Circuit Diagram
5-1 SGH-A400 Power ON
'POWER ON' does not work
Check the current
consumption more than
100 mA
Check the
Battery Voltage more
than 3.3V
Check the pin
38 of U400 is more than
3.2 V
U400 pin 33,28,30
= 2.8V
Check the clock signal
at R105
Check the initial operation
END
Y
Y
Y
Y
Y
Y
Y
SAMSUNG Proprietary-Contents may change without notice
N
Download again
N
Charge the Battery
Check to the path from CN604 to pin
N
38 of U400 and keypad
N
Check the clock generation circuit
N
(related to U400 and OSC100)
5-1
Change U400
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