Chart Of Troubleshooting - Samsung SGH-B500 Service Manual

10. Flow Chart of Troubleshooting
10-1-1. 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 UCD300
Pin#D6 >= 2.9V
Pin#F3 and pin#E14
=2.9V
Check the clock signal at pin#21 of RFT100
Freq = 26MHz
Vrms >=300mV
Vpp ≒ 900mV
Check the initial operation
END
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
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Charge the Battery
Check UCD300 and C325
No
pin#A6 = 1.8V
Yes
Check the clock generation circuit
(related to OSC100)
10-1
Check UCD300 and C324