What is this sandy substance leaking from my tv

I have a year old TCL 5 series s535There's some kind of glass/sand/salty looking substance leaking from my tv only from the very center bottom vents.I have a 4 year old so the idea he threw salt wasn't out of the question I'm not smart so I tasted it can confirm not salt not sand really flavorless hopefully non toxic. It's definitely falling from the TV I taped a piece of paper to the TV to verify it's not coming from the wall.