Flow Chart Of Troubleshooting 9-1. Baseband; Power On - Samsung SGH-D520 Service Manual

9. Flow Chart of Troubleshooting
9-1.Baseband

9-1-1. Power ON

'Power On' does not work
Check the current consumption
Current consumption
>= 100mA
Check the Vbat Voltage
Voltage >=3.3V
Check the pin of U100
Pin#J12 >= 2.8V
Pin#A13 and
pin#A14 =2.8V
Check the clock signal at C601
Freq = 26MHz
Vrms >=300mV
Vpp ≒ 900mV
Check the initial operation
END
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Charge the Battery
Check U100 and C110
pin#G11 =
1.5V
Yes
Check the clock generation circuit
(related to 3pin of OSC600, C602, R601)
9-1
No
Check U100, U105 and U106