Samsung SGH-D720 Service Manual

Also see for SGH-D720: User manual

SAMSUNG Proprietary-Contents may change without notice2. SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams2-28This Document can not be used without Samsung's authorization2-1.Baseband2-1-1. Power ONCheck the currentconsumtion more than100mACheck the Vbat(battery+O)Voltage more than 3.3VDownloader againNOCharge the BatteryNOCheck BTC300, C308 and C307NOYESYESYESYES'Power On' does not workCheck the pin4 of TR600 is morethan 3.3VCheck the pin1 of TR600 is morethan 3.3VUCP100 pin A19= 3.0VYESCheck TR600, TR602 and D601NOCheck U605 and C606NOUCP100 pin B14= 1.8VYESCheck U605 and C605NOUCP100 pin A15= 1.6VYESCheck U604 and C618NO'Power On' does not workENDCheck the clock signalat pin1 of OSC100Freq=12MHzCheck the clock generation circuit(OSC100)NOYES