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Other than a bad digitizer (touchscreen) or connection, sometimes just a tiny bit of gunk/debris gets in that tiny gap that goes around the outside of the screen. That often results in the same problem,, a non-working touchscreen. Take a very thin edged piece if cut plastic as a "tool" to clear out gunk/debris from this gap around the edge of the screen. Some people even have used like the opposite end of a sewing needle (not the pointed end).
Many ppl have fixed a non-working screen simply by cleaning out this tiny edge gunk. Give that a shot as a first step. If you use care, you won't damage anything.
Three possibilities: you have muted your microphone (sometimes by using an external mic it turns the internal one off), you have turned the mic down to the point where it's so low it isn't picking anything up, or the mic is broken.
Look around under settings and check the mic volume and mute settings. If they are okay then I'd say the mic has gone south.
If the phone lights up when you plug in the charger it is probably the ribbon cable that flexes every time you open the keyboard. About 25 bucks from cellphonerepairshop.com. Be sure to flip up the little latches on the flex cable ends before attempting to plug or unplug the cable ends.