![background image](http://html.mh-extra.com/html/samsung/sgh-u600/sgh-u600_service-manual_1191188016.webp)
3. Flow Chart of Troubleshooting
3-1
3-1 BASEBAND
3-1-1. Power ON
'Power On' does not work
Yes
Check the current
consumption more
than 100mA
Download again
No
Yes
Charge the Battery
Check the VBAT
more than 3.3V
No
Yes
①
Check the
VLDO7_1.8V
of UCP300 is more
than 1.8V
Check
UCP300
and
C314
No
Yes
Check
U201
②
Check
U201
pin 1 = 1.8V
pin 4 = 1.6V
pin 7,9 = 1.5V
No
③
Yes
Check VRF of
UCP300=2.9V
Check
UCP300
and
C315
No
Yes
④
Check C131
Freq = 13MHz
Vp-p > 0.8V
Check the clock
C131
No
Yes
Check the initial operation
Yes
END