My in-built mic in my TOSHIBA Satellite P50 worked perfectly until it suddenly stopped working. I’m running Win10 on a 64-bit system. All settings seemed to fit perfectly and Conexant SmartAudio HD device was enabled and selected as default device with correct levels (Microphone Array and Boost) and was not muted and green highlighted. What finally helped was a different sample rate setting! I changed under Windows -> [Settings] -> [System] -> [Sound] -> under "Input" [Device properties] -> under "Related Settings" [Additional device properties] -> folder [Advanced] the sample rate under "Default Format” to [2 channel, 16 bit, 96000 Hz (Studio Quality)] and boom, it worked! Funnily the default value that is selected with [Restore Defaults] to [2 channel, 24 bit, 48000 Hz (Studio Quality)] does NOT work! It took me hours to find this out - and I guess it might have changed while working with Audacity.

Nice description. I would add in step 16 the following (since it is the most difficult part that needs attention):

* The volume up/down and Bixby button comprises two pieces, the one with contacts that are connected with the cable that is attached to the phone (part 1), and another part (part 2) that sits between the contacts (part 1) and the buttons you push outside from the phone (part 3).

* To pry the two pieces from the phone you should start to lift up the metal nose above the cable, which is connecting the buttons with the phone on the top close to the volume-up button.

* As soon it is coming out a little bit you can continue on the very top to lift up the power button as there is a little gap where you can squeeze the spudger in between the plastic cover and metal of the power button.

* Try to lift up the power button on the lower side close to the Bixby button next and continue on the top and button alternately.

* Take care since the two pieces are squeezed tightly into the cavity.