Blue Light on Ultra stays on. Black screen on TV when power button on remote is pushed.
I have two Roku devices: an Ultra and a Streaming Stick 4k, each used on a separate TV.
Both Rokus have a blue indicator light that lights when the Roku/TV is on.
For the Streaming Stick 4k, the light turns off when the power button on the remote is pushed to turn off the Roku/TV, and it stays off.
For the Ultra, the light turns off when the power button on the remote is pushed to turn off the Roku/TV, but always turns back on after a short time, even if the Roku/TV is not turned on with the power button on the remote; the TV stays off in this case.
The PROBLEM: when the blue light on the Ultra is on (it's steady, not blinking) and the TV is off, and the power button on the remote is pushed, the TV turns on, but the screen remains black, and sometimes shows a message that the Roku can't connect to WiFi; I've checked the TV to which the Streaming Stick 4k is attached when I've seen this message, and that Roku/TV works fine, including the connection to the WiFi - the Wifi is working well. The TV with the Ultra is attached is much closer to the WiFi (about 20 feet away, with a nearly direct line of sight - no walls obstruct) than the TV with the Streaming Stick 4k attached.
When the blue light on the Ultra is off (before the Ultra turns on by itself), and the TV is also off, and the power button on the remote is pushed, the Roku/TV turns on, the Roku home screen appears quickly, and everything works very well.
When I get the black screen, I can recover from the problem by EITHER: turning the Roku/TV off with the power button on the remote, and then turning in on quickly, before the Roku turns itself back on OR: by pushing nearly any button on the remote (I haven't tried them all) EXCEPT the power button, which causes the Roku/TV to turn off (including the blue light) and then turn back on, after which everything works fine.
When the blue light on the Ultra is on, and the TV is off, I can turn on the TV (the Ultra is already on) by pushing nearly any button on the remote INSTEAD of the power button. The TV then turns on and the Roku homepage shows almost immediately.
HOW CAN I GET THE BLUE LIGHT ON THE ROKU Ultra TO STAY OFF; is the Ultra defective? Should I return it for exchange? Or is there a fix for this?
I've disabled screen saver: no effect.
I've switched the Ultra to my other TV; the Roku behavior is the same with that TV.
I've reset the Ultra several times, by unplugging everything (Ultra, TV, modem/router), and by pushing home 5 times etc...
model: 4802X -Roku Ultra
serial: X0100077GRW7
software vers: 12.5.5 build 4174-C2
Just to clarify since you used "Ultra/TV" a few times. The Power button on the Roku remote does nothing to the Roku device. The power button is a "tv control". It only powers on and off the TV via IR.
You are seeing the black screen because the power button is simply turning the TV on. (not the Ultra). On my Mitsubishi TV, I would see a blue screen if i followed the steps you were doing. Others may see a "No Signal" message screen.
After turning on your TV using the power button (and seeing the black screen), you should be able to press the Home button on your Roku remote. (this will wake the Roku Ultra and you should now be on the Home Screen). Basically the HDMI input is dormant until some action (pressing the Home Button) activates it.
The only time I can use the Power button to return to the Home Screen being visible is if I just turned off the TV and the device has not yet fallen asleep.
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As for the blue light that comes back on, some users have reported that their Ultra (4800 series) light sometimes never goes off. That could definitely be a Roku software/firmware issue, but does not affect everyone's 480x models, so may just be with some TV manufacturers. Just for troubleshooting purposes, see if disabling the TV's HDMI CEC helps with the issue. (use the TV remote, not the Roku remote, to go into the TV's HDMI settings and disable the HDMI CEC. Depending on your manufacturer, the HDMI CEC can be called a few different things.)
I would also try setting the Screensaver Start Time to come on a little earlier (try 10 min), and also use a Roku default screensaver for testing. (ie. don't use a purchased screensaver if currently doing so). Would also try enabling "Auto Power Savings" under your Settings/System/Power/Auto Power Savings and see if that helps keep your light off.