N70,N72 NO OPERATOR FOUND SOLUTION REPAIRING STEP BY STEP
1)PUT SIM THEN GO MENU+TOOL+SETTING+NETWORKSETTINGS
CHANGE THIS MODE GSM
THEN CHECK PHONE NETWORK STATUS SAME NET WORK PROBLEM???
2)(A)GO MENU+TOOL+SETTING+NETWORKSETTINGS
CHANGE OPERATOR SELECTION
AUTOMATIC TO MANUUL MODE
THIS TIME PHONE GOING TO SHOT SEARCH?THEN SHOW NO OPERATOR FOUND MESSAGE?
CHECK AN****A PAD OR AN****A PAD INTERFACE
40%AN****A SWITCH PROBLEM CHNAGE (AN****A SWITCH)
2)(B)MANNUL SEARCHING TIME PHONE GOING TO LONG SEARCH?
FIRST CHANGE, C7524 OR C7573 CAPACITOR
AFTER CHANGE THIS CAPACITOR SAME CONDITION UR PHONE?
SECOND CHECK OR CHNAGE G7500 VCO OR SECOND LOCAL CRYSTAL(38.4Mhz)
1. BSI line is not connected properly in connector -> Check cable, also for 3.3k resistor in serial with bsi line.
2.UEM damaged -> replace UEM.
THIS ERROR MAINLY BSI LINE RELATED PROBLEM
STEP-1--CHANGE BATTERY
STEP-2--RESOLDRING BATTERY CONNECTOR
STEP-3--REMOVE BSI LINE RELATED CAPACITOR OR VERISTER
STEP-4--CHECK BATTERY CONNECTOR BSI TO BSI LINE RESISTER WAYS
STEP-5--REMOVE BSI RESISTER(vr5)
SAME PROBLEM AGAIN CHANGED vr5 RESISTER
STEP-6--CHANGE BOTTOM EASY CABLE PORT CONNECTOR
PROBLEM SAME REBALL OR CHANGE UEM
POST RESULT
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