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But no cellular signal

Wifi & Bluetooth work perfectly...

But no cellular signal

If I reset the phone in network settings

Or restoring it it works on cellular signal for 15mins -1hr....

Then it shows no signal again

Why????

Is it a antenna problem

Or something in the logic board like a ic problem or some type of ribbon cable that got damage

Not the Touch ID does not work on this phone also the screen has been repaired or replaced.... something could have beeen damage as a result

I'm running ISO 10.2.1

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Is possible the motherboard has been damaged during the screen repair. I have seen this happen many many times on the iPhone 5/5s/5c. Where the screw driver or pry tool slips while removing the screws or prying the batt / screen connectors.

It's also possible the screws for the screen have been put back wrong. For example if a long screw was put in position of a short one, then it's possible it has gone down far enough to scrap against the mother board and cause this issue.

You mentioned the antenna. This shouldn't really have been touched during a screen repair but not going to rule it out. However i have found with some iPhone 5's with this issue that changing the antenna had no effect. Bringing it back to a board issue.

If it's a board level repair it maybe very costly.

Hope this helps

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Justin será eternamente grato(a).
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