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galaxy s3 lte doesn't read a sim card

Hello. I have a galaxy s3 lte(i9305) and the phone stop stoped reading my sim card. I ordered a new sim card tray and reaplace it but still the same problem. The phone read a SD micro card normaly so the problem is not in sim card tray. I also HARD RESET the phone and try a few other trick that i find online, but no good. Is the problem on the main board?? Please help.

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