Chart Of Troubleshooting - Samsung SGH-P520 Service Manual

10. Flow Chart of Troubleshooting
10-1 BASEBAND
10-1-1. Power ON
'Power On' does not work
Yes
Check the current
consumption more
than 100mA
Yes
Check the VBAT
more than 3.3V
Yes
Check the
VLDO7_1.8V
of UCP300 is more
than 1.8V
Yes
Check U302
pin 1 = 1.8V
pin 4 = 1.6V
pin 7,9 = 1.5V
Yes
Check VRF of
UCP300=2.9V
Yes
Check C113
Freq = 13MHz
Vp-p > 0.8V
Yes
Check the initial operation
Yes
END
10-1
No
Download again
No
Charge the Battery
①
No
Check UCP300
②
No
Check U302
③
Check UCP300
No
and C310
④
No
Check the clock C113