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the iPhone 5 has taken some heavy damage but it’s still working fine, but when i make a call there is no sound. i can’t hear the other side and the other side can’t hear me, not even a dialling tone. i checked the earpice and the microphone with the voice memos app and it works fine, there is also good reception and i can surf the web and use other apps like Skype and whatsapp. i did a little digging on the internet and some say the problem is the baseband chip U501_RF, is that true and if so how can IFIXIT?

Hi nicolasphilippides I figured it out. you will need to reflow the baseband chip. take the logic board out and with a hot air rework station heat the baseband chip. i used 350 degrees celsius with air pressure on 5 with a hakko station and 4.4 mm nozzle, heat the chip in a circular fashion for 30 seconds. if that doesn’t do the trick or if the problem reoccurs you will need to replace 3 chips as they are all paired:

  1. Hynix H2JTDG2MBR (nand flash)
  2. Qualcomm MDM9615 (baseband chip)
  3. U601_RF (baseband memory) which is not that simple so basically not really worth it on an iPhone 5 IMO. thats all the information you need, good luck.

Can you use the microphone and record things or did not work the game .Does music player through the speakers without a helmet. If all this work it may just be the Mic antenna. Here is a solution for it. hope this helps https://www.youtube.com/watch?v=0jhWxYTV…

I have exactly the same problem… If someone can help us :)