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N70,n72 no operator found solution


N70,N72 NO OPERATOR FOUND SOLUTION REPAIRING STEP BY STEP

1)PUT SIM THEN GO MENU+TOOL+SETTING+NETWORK SETTINGS
CHANGE THIS MODE GSM
THEN CHECK PHONE NETWORK STATUS SAME NET WORK PROBLEM??? 
2)(A)GO MENU+TOOL+SETTING+NETWORK SETTINGS
CHANGE OPERATOR SELECTION 
AUTOMATIC TO MANUAL MODE
THIS TIME PHONE GOING TO SHOT SEARCH?THEN SHOW NO OPERATOR FOUND MESSAGE?
CHECK ANTENNA PAD OR ANTENNA PAD INTERFACE
40% ANTENNA SWITCH PROBLEM CHANGE (ANTENNA SWITCH)
2)(B)MANUAL 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)
NOT SOLVED UR PROBLEM?
REBALL OR CHANGE VINKU

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