TV is 1995 Model 25TRC1-0101 Magnavox. Seems to

https://techlore.com/article/how-disable-demo-mode-magnavox-tv

With the set ON. Press the volume up AND volume down at the same time. OR
Press the channel up AND channel down at the same time.

Hi,If I understood correctly you broke antenna out socket of Cable box..ok no problem,your TV and cable box should have other jacs/socket for this connection as well..
Take the A/V output of your cable box into TV possibly with RCA cables..than you can select the channel thru Cable box on TV ..(AV mode needs to be selected on TV )

** in order to listen and watch your magnavox DVD 's "2xRCA audio" and "1x RCA Video" cables "OUT" should go to Tv or Cable box "IN" connections separately ..("IN" goes to "OUT" of other ..pls remember,Always reverse connected ) (audio will come thru Receiver and TV.)

Since you successfully connected your Receiver to play video on TV (one way only ) ,here is the second reverse action if you wish to listen or RECORD a program on your TV on magnavox
** you need to connect "Audio Output " as can either be : RCA jacks or "Optic cable output" or "SCART "connector " of your TV or Cable box .( every TV -cable box has different type of Audio out jacks )
** to "iRCA nput or "Optic Cable input" of your magnavox (whichever you want ,based on the necessary cables on your hand )

There you go..Tv/Cable box video and sound are both on the magnavox for recording..

Hope this helps!..if more help requires pls let me know.
Take care and please Remember to rate/vote and give me 4 Thumbs Up for me to
continue for Helping out the Community :)

There may be a way to get to the audio and video without a remote by first pressing the menu button on the front of the set (if there is one), but the easiest fix is to invest in a good universal remote which will allow you to open the full TV menu. From the start up menu the remote will, after matching the code, allow you to go deeper into the start up menu to the audio/video menu and on to the "regular TV mode".

This would be VHS only that i know of if you do not have a remote to switch to the other side is what you need its available at www.remotes.com but I beleave this is VHS only. thanks

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

on the set press and hold the up and down volume buttons together till the tv turns off then press power to turn back on and everything should be fine

I know of no solution for this, it is the normal operating mode of the system.

I have not worked on this model of set, but on many TV models, you can get it out of the demo mode by holding down the menu button for at least 10 seconds or longer.

If this does not work call the tech support for your set. They should have a definate answer. It is also possible that there is a fault condition with the set, and it is not properly responding to the front panel controls to be able to be put out of the demo mode. But, this is not a common type of fault.

Jerry G.

THANKS FOR THE INFORMATION ThaMp3DOCTOR. PRESSING THE VOLUME+and CHANNEL+ SIMULTANEOUSLY FOR 5 SECONDS WORKED!   THANKS

My wife somehow put our Magnavox TV into demo mode too...

Plug in the set. With the set ON. Press the volume up (+) AND volume down (-) at the same time.

This worked to get it out of demo mode!