Bird Cell Phone v750 mic problems can occur due to faulty mic or microphone is not properly connected to the phone motherboard. Bad connection can occur due to various reasons such as if it is dropped or exposed to water wet, a bad connection can also occur due to corrosion, rusting or even a short-circuit. So first of all you have to clean the Bird Cell Phone v750 mic connection to connect to the phone either on board.Here is a attached diagram for this problem, observe diagram and follow the instructions entioned in diagram and do jumpers like diagram below.
Bird v750 mic solution Jumper

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