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