Welcome aboard to the forum
I heard of people complaining about LiteOn’s 16:9 mode causing their TV to switch to 4:3, as if the LiteOn’s 16:9 mode cancel’s the TV’s aspect ratio setting out! It may be worth altering the settings about to see, just in case. For a start, I would suggest trying the following:
If your TV is 4:3 : Set the TV’s AV2 input to ‘4:3’ and change your LiteOn to 4:3 L.Box
If your TV is 16:9 : If your TV has a ‘Stretch’ option, choose this for AV2 and set your LiteOn to ‘16:9’ Alternatively, set AV2 on your TV to ‘16:9’ and set your LiteOn to ‘4:3 L.Box’. If Either of these don’t help, try the ‘4:3 Pan’. However, I got a feeling in this case that the LiteOn will digitially resize the image rather than output a full frame.
The front display icons are mentioned at least on their website manual for your LiteOn. See the following link to download a PDF version of the manual:
The image below is a snapshot from the lower half of page 6.