Tv rca televison model DZ7649 Entertainment series

Question

My momsa televison is having issues with sound.  Hit the volume and it does come on till the it is turned up half way. So half way you can barely hear and then when we turn up sound full blast we can just hear it .  I have check the audio but not sure what it shopuld be on stereo, stereo dba  or something.  What do I need to do to restore her sound.

 

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