I have a black screen and sound but no picture. hisense 32k20dw

I have a black screen and sound but no picture. hisense 32k20dw

ANSWERS:

I have the same tv and my screen just went black without warning and won’t come back on. The sound still works and I can change channels, just no picture. I do not have a hissing noise with mine. I am unable to pull up the settings, input, or guide because I can’t see anything.