How to change input on digital stream - Symphonic ST420FF 20" TV

Usually it is a matter of changing the source or input on your TV from the HDMI or Video Input Port Used by Your type of ROKU to the HDMI or Input Port Used by Your Dish Converter box ( If You can't find them by scanning Your TV's Input ports You can follow the cables and see were they go if you can get to them)

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Might want to check the input. Very few sources are recorded in full 7.1. In auto you will only see what is encoded in the digital stream coming over an HDMI input. If you're using the component 7.1 inputs, you can select the 7.1 input directly using the remote.

make sure to set the input source of your tv to the right input. if you're using hdmi cable to connect the roku to tv, set the input source of the tv to hdmi as well.

try to swap the ends of the hdmi cable. turn off roku and tv as well.

depends on what input port you plugged into. HDMI1 HDMI2 HDMI3
the tv input select source has to match
I have a similar device plugged into HDMI3 so I select on the input source HDMI3 to see it on the TV.

Your TV has only A/V inputs. Red and White is to connect the audio outs of the streaming media, and Yellow for video. But here, your streaming media player have only HDMI output. That is, it is compactable only to TVs, which have digital inputs, where your TV has not. A converter [HDMI to A/V] in between the two devices will do it to work. There is no other chance.

I've had a quick look at some instructions online, can't be sure if I'm looking at the same device as you but.

Guesstimating, you're connecting via the composited A/V jack out from your box to RCA (red,yellow,white) inputs on your tv. Or the same but using a SCART converter.

If so, once you've turned it all on, you probably have to change to the correct AV input on your TV. Just keep pressing the AV button on your TV remote control, it should cycle through all the AV inputs until it gets to the one you require.

If the tv does all those symptoms but after some seconds the tv works and stays doing the job. THen the tv has a slow microprocessor to recognice the different resolutions or video inputs.

But if the tv cannot do anything and stay aout of signal forever. send the tv to the waranty. (no waranty? you have to use the component input instead to have digital signal reproduced

Do an EEPROM reset and will be ok.

"Unlocked" only means that it isn't detecting a digital signal on the input. "Locked" conversely means that it has locked on to a digital signal. My Sony receiver behaves this way.