Hi' look top right of you tab screen if there is headphone/earphone icon.
If the icon is there then it is hardware related issues' try this
Solution 1. Insert and remove your earphones several times or until the icon disappear.
Solution 2. Insert your earphones, restart/reboot your tablet by pressing the reset button in the pin hole and then remove the earphones when the screen goes black.
Solution 3. Hard reset your tablet to factory default.
This can coursed by any liquid related went inside the earphone port.