My 3 y.o. 55" 4k TCL ROKU TV screen suddenly started flashing to black every 10 secs or so on the right side only. Audio was unaffected.
A quick read thru related posts (everyone else seemed to have the whole screen flash black) suggested this was power consumption related and manipulating Picture Settings, specifically TV Brightness, Picture Mode and Dynamic Contrast might help. I'll let you read thru for the details and permanent fixes, however, this post is to confirm the suggestion provided a temporary solution for me.
Here's what I did:
TV Brightness - Lower from Normal to Dark
Picture Mode - Lower from Enhanced to Vivid
Dynamic Contrast - Lower from High to Low
The flashing stopped.
I went back a bit later to try different combinations and was able to return the Picture Mode and Dynamic Contrast to the original higher settings. However, any combination with the TV Brightness setting at Normal or above resulted in the return of flashing.
As a result, my Picture settings now are:
TV Brightness - Dark
Picture Mode - Enhanced
Dynamic Contrast - High
If that fails, try manually lowering your backlight setting too. Hope this helps get you up and viewing again!
