Chart Of Troubleshooting; Baseband; Power On - Samsung SGH-S720i Service Manual

3. Chart of Troubleshooting

3-1.Baseband

3-1-1. Power ON

'Power On' dose not work
Check the current
consumption more than
Vbat more than 3.3V
Check the VCORE_1.5V ≥ 1.5V
and VCCD_1.8V_E ≥ 1.8V
Check VCCD_1.6V and
VCCD_1.8V of U303
Check VRF_2.9V of
UCD300 and U100
Check Pin #8 of RFT100
Freq=13Mhz, Vpp>0.4V
Check the initial
YES
100mA
YES
Check the
YES
YES
YES
YES
YES
operation
YES
END
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
NO
Download again
NO
Change the Battery
NO
Check UCP300 and C316 and C314
NO
Check C329 and C328 of U303
NO
Check UCD300 and C310 and C139
NO
Check RFT100 and C133
3-1