Flow Chart Of Troubleshooting; Baseband; Power On; Baseband 9-1-1. Power On - Samsung SGH-X830 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 U100 & U112
C133 >= 1.57V
C110=2.9V &
C111=2.8V ?
Check the clock signal at pin#19 of U701
Freq = 13MHz
Vrms >=480mV
Vpp ≒ 1.34V
Check the initial operation
END
Yes
No
Yes
No
Yes
No
Yes
No
Yes
③
No
Yes
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Charge the Battery
①
Check U112 & C133
No
HPEIO = 1.8V
Yes
Check the clock generation circuit
(related to OSC700)
9-1
②
Check U112 & C134
④