No Service - Samsung GT-I9300 Service Manual

Level 3 Repair

8-3-3. No Service

Check memu setting
Menu → applications → setting → wireless and network →
mobile networks → network mode → setting is auto mode ?
Menu → Phone → Keypad →
*#1234# → check Phone version →
PHONE : I9300XXXX or
PHONE : unknown
Check the CP_VSD1,CP_VSD2_1.8V
CP_VSD1 (C342) =0.9~1.4V
CP_VSD2 (C344) = 1.8V
VREF (C348) = 600mV
Change the board
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No service
Yes
PHONE : unknown
Yes
Check VREF
Abnormal
Yes
END
PHONE : I9300XXXX
Check the contact of antenna.
( ANT102, ANT103@ page2 )
No
No
8-10
Replace the UCP300
Replace the UCP300