iPhone 3gs Not Detected Problem Repairing Solutions are available in the following article. Also you will find iPhone 3gs USB Not Working solution information in the diagrams further in this post.
In iPhone 3gs Not Detected problem can occur because of the faulty USB Connector or it’s bad connection to the Cell Phone’s Motherboard. So first of all you should clean iPhone 3gs USB Connector and Motherboard of the Mobile Phone. If that does not work then you can replace the USB Connector.
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Here Are iPhone 3gs Not Detected USB Problem Solution. Please study these diagrams very carefully before you start repairing.
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Note: Every repairing solution posted here is tested by at least one member of our team. Use the information available here at Your Own Risk. We are not responsible if any harm comes to your device during the repairing process.