I am guessing that your DVD player could be broken and the laser part that reads the disc's is also not working too and the disc drive is also broken. The disc drive and everything that is attached to the disc drive needs to be replaced all together.
It could be that the board inside of the remote where the buttons are attached to are dirty and need to be cleaned with qutips and rubbing alcohol or there is a problem with it's infared sensor on the remote or on the TV it's self or pairing problems or if the remote was damaged then. In those cases I would buy another remote for your TV.
last man on earth on tape?
buy 2 machines used and now have parts( NO OTHER WAY!!!)
there is no books AT SONY or support now. it ended long ago\ 1987 ,35 long years ago/.
the free shop manual is here, 155pages
I would try and unplug the TV and all of the attachments that are connected to your TV and wait for a few minutes to plug everything back in again and see if that fixes the problem. It could be an issue with your TV's mainboard or a power supply issue.
Make sure the MUTE function has not been activated. Try turning up the volume level. Check that there are no headphones connected. Check if the issue also occurs to other device connected to the TV.
https://www.sony.com/electronics/support/articles/00023449
5 red flashes is a bad panel connection or internal panel short, very carefully take the panel connectors off and reseat them and see if that helps, unfortunately you may have a bad panel.
Probable damage to the main board caused by lightening/storm activity.
It is possibly not ever going to be a successful repair.
Being LCD it is older technology and spares will be few and far between, not to mention expensive.
need service manual to determine the fault code usually by counting the blinks normally the blink should pause to let you know the count the look at the symptom on manual.