Roku has been working for months tv screen turned black today in middle of program now nothing. Roku is working because power indicator lights up but nothing on screen.

Please check it "Solved: Roku TV Screen Won't Turn On - Roku Community"

It's possible that there could be an issue with the HDMI port affecting the display picture.

Try connecting you Roku device to a different HDMI port on the TV, and then playing content again.

Try using a different/new HDMI cable to connect your device to your TV.

lost the free manual? it has simple instructions.

no RoKU stated model, saying just Roku means nothing, oK>
it has a real name and model, just like you unstated TV.
lots of Roku)
I have the Ultra (non Dongle) not the STICK.
mine is (best) a floating box. with 1 AC power pack (see?)
and is not optional.
first is power, the Ruku must have power.
then on mine power light on the roku glows
next is internet
and last is hdmi connected to TV.

Power, then internet and hdmi.
finally is TV set to TV's hdmi port number that is ROKU.!
if our ROKU is only a streaming stick (DONGLE)
it steals power from the TV HDMI port.


mine is ethernet connected for max performance

my guess is you have the TVs input selector set wrong
wide guess blind to true MODEL I am, non stated
good luck
and nothing beats a ROKU,
for 1 reason the player apps in it all work and are updated for free.
That is why TVs no come with ROKU inside for that 1 reason.
I use ROKU plex and to my own private servers.

To turn off closed captions on a Roku player, pess the * button on the Roku remote. Under Closed Captions, set it to Off. Press the * button again to close that menu.

Please contact RUKU support, they will know what the message means and how to fix it, chances are the device is defective.

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

if you're only seeing white roku, it's on screen saver mode. if the remote didn't work, try to change the batteries and try again. you can also power cycle the roku unit by unplugging the power cord from the power outlet for 20 seconds.

Out of the blue, my ROKU had sound but no picture.

To correct, I unplugged the Roku for 5 minutes. I restarted the Roku and the problem was corrected.