Samsung GT-B7300 Service Manual page 28

Flow Chart of Troubleshooting
9-1-2. Phone Part
'Phone Power On ' does not work
Check the Battery Voltage
is more than 3.5V
Check followings :
C404 is 2.7V
C416 is 1.2V
C426 is 1.8V
Check C419 is 2.6V
Check pin 1 of U302
is 'H'
Check C420 is 2.6V
Check the
TP_TCXO_EN is "H" and
C423 is 2.85V
Check R408 is 'H'
Check the initial operation
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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No
Change the Battery
No
Check the U401
and the related circuit
No
Check the U401
No
Check the U302 and related circuit
No
Check the U401
No
Check the U401
and the related circuit
No
Check the UCP300
and the related circuit
9-4