Fifth generation of iPhone. Repair of this device is straightforward, and requires screwdrivers, prying tools, and patience. GSM/CDMA / 16, 32, or 64 GB / Black or White.

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Weak GSM Network after Screen/Digitizer Replacement?

Ever since I replaced my screen on my Verizon 32GB 4s, my GSM Network service has been very weak. It will fluctuate from 1 bar to full bars and 3G, back to roaming over the course of a few minutes while driving. I have sent the phone to 3 iphone repair shops that have been unable to resolve the issue.

We have changed out all the antennae parts and also ensured that the little blue inductor above the main antennae connection on the logic board is still present(not sure if working). Wifi works great. 1 shop did switch out the logic board with another phone temporarily to see if that resolved the issue and it did.

Any suggestions on how to troubleshoot the issue on the logic board to see if this issue can be resolved without replacing the whole board?

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Do you have a Another iPhone4S? if have then interchange the Logic boards to check this faulty logic board is working in another iPhone. If working then its just the other parts problem or poor fitting of parts inside the bezel. If not have any other phone then Dismantle the iphone properly then put back the parts one by one by procedure as on ifixit. it will sure work . Inside 4S have 4 antennas . one is downside with speaker fitted in bezel , second is right side upper conner , third is under the camera, fourth is other side on the logic board ( you will see the wire connected both sides) . these all are properly fitted on their proper places to work fine . Best of luck

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Ryan will be eternally grateful.
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