SAMSUNG SGH-A400
Manual de Servicio

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