How to repair Tecno M3 mic or mouthpiece
This is just simple with good brain, ability to concentrate and working skill you are good to go.
Loose your Tecno android M3
Carefully remove the panel to see the front screen. Here you should be careful because if this is the first time of loosing this phone you may end up breaking the screen.
Use your rework Station and remove the old mic component.
Get your universal mouthpiece ready.
Get your connecting wires ready.
Get your hot soldering iron and lead ready.
If the printed board point is no longer there make this jumper.
Follow the diagram below:-
Tecno M3 mic or mouthpiece
Also check these solutions
Nokia Lumia mic Solution
Nokia 210 mic solution