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Hi,
Could you please elaborate? What do you mean by chip? What are you trying to do with the phone?
Since you talking about signal, I suspect that you mean the SIM-card? Have you tried different SIM-cards to see if same behaviour appear?
If you have tried different SIM-cards and also a software repair but you still have no signal, I would suggest that you visit nearest service center to have your phone examined by a technician. You can contact your Local support for information about nearest service center and/or how to proceed with this in the best possible way.