If you own an older model of LG TV, don’t worry.

Select any number of images from your TV gallery to show as a screensaver. This would hide the error message from your TV.

To be more specific:
First, save the pictures you want to display as a screensaver to your TV. Make sure to save them all into one folder.
Go to the Gallery, where you can see the pictures you have saved on your TV.
Select the first picture and click on Option.
Select set as a screensaver.
Following these steps will remove the no signal message from your LG TV.

How To Update Your Firmware Version Manually:
You can update the firmware of your LG smart TV manually with a USB drive. We will show you how to update LG TV software manually.
Find The Correct Model:
Finding the correct version of your TV is crucial. The TV will not update if the software is not compatible.

To find the compatible software for your TV, follow these steps:
Go to LG website: https://www.lg.com/
Hover over “Product Support” and then the menu will expand.
Select “Software and Driver”. Then a search bar will appear.
Search with your model number, then select your TV from the dropdown list.
Download The Firmware:
After you find your model-specific software update, the rest of it is easy. Just get a USB drive that has 1 GB or more space and do these:

Insert the USB drive into your PC.
Make a folder named “LG_DTV” on the USB drive. The folder name must be exactly as advised.
Download the zip file and after downloading extract the file in the folder “LG_DTV”.
Now It’s Time To Upload:
Well done, only a few steps left. If you have followed all the steps mentioned above, then the rest should be easy. To complete the process, you need to-
Remove the USB from the PC and insert it into the TV.
Then the TV will show “USB Update Ready”
Find the button that says “Install”, then click it.
Follow the instructions shown on the TV to complete the installation.
Turn the TV off for at least 10 seconds, then turn it on for the update.
That’s all there is to know about removing the “no signal” message from your LG TV.