Power On - Samsung SGH-N288 Service Manual

5. Flow chart of trouble shooting

5-1 Power ON

'POWER ON' does not work
Check the Battery Voltage
between D100 and M100 = 3V
U102, U105 pin3 = 3V ?
Check for the clock signal at R646
Check the initial operation
Flow chart of trouble shooting
Yes
is more than 3.2V
Yes
The node
Yes
U106 pin 1,4,10 > 3.2V
Yes
Yes
Yes
END
No
Charge the Battery
No
Check U100 and the path from +VBATT
No
Check the circuit related to U106
No
Check U102, U105 and related circuit
No
Check the clock generation circuit
(related to U613 and Q604)
to M100
5-1