Microphone not working Latitude E6540

Many methods have been tried, both related to drivers and to the usual Windows settings, in the device manager there are no undefined devices that can be updated and are associated with a microphone, there are problems only with GPS and fingerprint drivers, also in the sound tab "record "There is not a single microphone except for the Realtek High Definition Audio board, it also does not perceive sound, what should I do?