Troubleshooting - Samsung SCH-211 Service Manual

6. Troubleshooting

6-1 Logic Section
6-1-1 No Power
Press PWR button.
U123 pin 2=7.2V?
U121 pin 4 input=4V?
U121 pin 6 output=3.3V?
U122 pin 4 output=3.3V?
U124 pin 4 output=5V?
Samsung Electronics-Contents may change without notice.
N
Y
N
Y
N
Y
N
Y
N
Y
END
Check the signal path from the battery
terminal to U123 pin 2.
Check U123 and its neighboring circuits.
Check U121 and its neighboring circuits.
Check U122 and its neighboring circuits.
Check U124 and its neighboring circuits.
6-1