I have similar issue since the update, though my other 55s515 dont have the issue. So for every Major Roku update since I got this tv has cause me issues. and would not be surprised if this cause that too.
And if this hardware issue then I question the quality of TCL/Roku I have LCD TV's and monitor 20 years old with 8+ hour of daily use on them with zero issue to this date not single deadpixel or line on them.
Hi @tsunami231
Thanks for posting in the Roku Community regarding the issue you are experiencing, and we're sorry for the inconvenience.
Please be aware that we have passed along your concerns and information to the appropriate Roku team to investigate further. Once more information is available, we will be sure to update this Community thread.
We appreciate your patience and understanding in the meantime.
All the best,
Arvy