Flow Chart Of Troubleshooting - Samsung SGH-F250 Service Manual

9. Flow Chart of Troubleshooting

9-1. Power On
' Power On ' does not work
Check the current
consumption more than
100mA
Check the VBAT
more than 3.3V
C319(VISA) = 2.6V?
Check the
VDD_IO_LOW_1.8V
of U305 is more than 1.8V
Check U305
VDD_IO_HIGH_2.9V = 2.9V
AVDD_2.6V = 2.6V
VDD_VIB_3.3V = 3.3V
VDD_SD_2.9V = 2.9V
VDD_PLL_1.2V = 1.2V
Check R120
Freq = 32KHz
Check the initial operation
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
END
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No
Download again
No
Check the Battery
No
Check the related circuit
①
No
Check the U305
②
No
Check the U305
R316, U302, C307, C311
③
No
Check the clock
9-1
and C333, R318,
R309
and C300, C305,
R120