1. sinic999's Avatar
    Recently whenever someone calls me, they are unable to hear and claimed that my phone's microphone is not working. However, when i try recording and used a hardware test app, the mic is working fine. In addition, cortana is unable to hear anything that I said.

    Is this a hardware or software problem??
    05-08-2015 07:08 PM
  2. ScrubbyXD's Avatar
    This is usually a hardware problem that requires a new daughter board.
    05-08-2015 07:32 PM
  3. sinic999's Avatar
    Does anyone else have this problem when they update their phone to denim?
    05-09-2015 07:40 PM
  4. Bob Ferrell's Avatar
    So I have been searching the internet for a solution from software to hardware. My problem like yours was no one could hear me thru the microphone and Cortana could not hear me either. I could make calls using the speaker phone option. My solution was replacing the Microphone assembly. I've never done any teardown like this before but did it on my own and now my phone is like new. Bought the Microphone assembly on e-bay for $19.94, the seller was "fix2save" and it did save my phone. Taking apart the Lumia 1520 was found on youtube using the replacing the screen video you just stop when they are taking off the microphone part. Good luck and I hope this helps.
    jmshub likes this.
    10-14-2015 11:36 AM
  5. Steve Thackery's Avatar
    Yep, I can confirm Bob's solution. This is a very common fault on the 1520 - the ribbon cable that feeds the bottom mic is incredibly delicate. Replacing the entire assembly - which has the ribbon cable attached - will sort it out and it's cheap.
    10-17-2015 05:33 AM
  6. robnewton's Avatar
    I had this issue, mine was a faulty headphone socket. something must have been stuck inside it, keeping the phone in headset mode.
    10-19-2015 06:57 AM
  7. Hector Pons's Avatar
    Specweapon replied on December 16, 2015

    Accomplishments

    In reply to FlappetteRides Again's post on November 9, 2015

    I have found a solution to the hardware fault on my phone, my microphone was never working so clearly hardware fault. I had the same microphone issues and the LED lights below my screen wouldn't work. I found that when i twisted my phone I could get them and the microphone to work, so it seemed like a bad connection in the lower daughterboard, upon disassembly I found the fault was actually where the ribbon from that board connects to the mainboard. In the picture below marked by the red arrow, I found that applying pressure made the Led's and microphone work. My solution was to stick a small piece of 2mm thick adhesive foam onto the silver cover so it applies pressure from the back cover.

    Phone is working perfectly now
    01-04-2016 12:27 PM
  8. shawnmos's Avatar
    I can confirm that it's the usb/microphone module. I also can confirm another common problem where the phone gets stuck in airplane mode is also caused by that same module.
    01-05-2016 12:34 PM

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