Question 13" AMPD LED TV-- POSSESSED????

Sep 5, 2022
Hi Everyone!
I use a 13" LED tv. that I've had since 2019 as a monitor for our home cctv. I'm using the two RCA jacks to get the picture and sound.
No problems until last week . The picture starts to shake and quiver, slowly gets darker and darker until its nothing but a black screen.
Soon afterwards it turns itself off and wont come back on until its been unpluged for about 15 minuets. Then the process starts over again.
Sometimes i can adjust the volume control and the picture will hold steady.... for a few minuets longer,then black screen -no power.
Is there anything i can do/adjust that will help or just buy a new TV?