Im here to share my experience, what i went through and how i managed to resolve it.
Day before yesterday, i encountered a black screen on my TCL Roku TV. I tired unplugging and plugging my device, checked all the cables connections but could't able to resolve it. Then, i found this page on browser and followed the given steps and able to resolve the issue. Here, i'm dropping the link of that page, so it will help others too. [link|https://droidtheory.com/fix-tcl-roku-tv-black-screen/|TCL Roku TV Black Screen FIXED]