The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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No Imei / Modem Firmware

So what happened is that we cleaned the little components and the front display connectors located at the top right of the logic board as there was some slight liquid damage causing the touch screen to behave erratically intermittently.

This in result solved that issue as we tried multiple new screens before that presented the same issue.

Now after doing that the imei and modem firmware is missing. Modem firmware says nothing and the entry for imei in settings about phone is not even there. I was expecting it to say imei with nothing at least.

Now the problem is that I don't know what capacitors or inductors to check on the logic board that connect to the baseband chip to power it. I doubt the baseband chip itself has gone bad. Dataline for baseband chip is probably fine too.

Any boardview files or schematics to look at to diagnose this issue better?

I have a feeling one of the capacitors or inductors blown up from a short somehow.

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@benjamen50 contact me by email for the documents you need.

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I managed to fix the issue by taking off the metal shields for the board at 450°C.

It's like reheating the board fixed the issue so problem solved. Weird..

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Deck the Halls
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Chosen Solution

The baseband flash chip is the chip covered in underfill next to the display connectors.

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Oh, that explains why it decided to not work after cleaning the upper part of the board with 99% isopropyl alcohol. Needed more cleaning. Anyway fixed now as said above.

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Most Helpful Answer

Then the best solution for you is to flux , solder , replace the capacitor (most common enemy each time) ,with a new one to be sure.

Take a multimeter and test it out

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