Hi,
I found this on the web.
An upside-down display on an LG TV screen may be due to an accidental press of the remote control button or a glitch in the TV settings. To fix this, you can try pressing the “Menu” button on the remote control and navigate to the “Picture” or “Display” settings. Look for an option like “Rotation,” “Flip,” or “Orientation” and change it back to the default setting. If this doesn’t work, you can also try unplugging the TV for a few minutes and then plugging it back in to reset the display settings.
Hope this helps