This quick test will help you determine if the backlights on your TV have failed. you can check the cables for faults using this setting. Some newer models will have an HDMI test mode.Occasionally non-certified HDMI cables will cause problems in this way, it is best to use certified cables.It might also indicate a problem with a particular connected device if ''that device'' doesn't work in any port.

If it doesn't, it could mean your HDMI port is bad or there is a major software glitch and a Factory Reset might be necessary. If that works see if another device will work in HDMI1.Some TVs will look automatically for the active source. Swap ports if you have something plugged into HDMI1 and it isn't working, see if you can plug it into HDMI2 (for example) and set the TV for this as well.Since you are already getting sound, it is highly unlikely that there is a mismatch between input and setting, If no issue go to the next item. Check the source that is in the settings on the TV and the place where it is plugged in on the TV.If this swap fixes a problem, then get a replacement cable and install it. Do this in turn for each source that you have. Use a known good cable and swap it with the cable from a particular source.

Do this for every device that is connected to your TV.

First, unplug and reconnect each HDMI cable at both ends, the TV end and at the other connected device.

There are two main points of failure, the input sockets and the cables. The HDMI Inputs can have problems that will interrupt the video signal, while still allowing audio to function.

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