Not familiar with your rig, but after looking at one on a sale site, it appears that the TV is mounted in a box at the center of the windshield. If so, look to see if the windshield side of the box is removable. May be a couple of screws holding it in place. Ours is a different brand, and there was a strap holding it in lace inside the box. And we have a removable frame around the front of the face that allows a bit of access. You probably have a strap over the TV holding it. We changed ours out several years ago, and it works much better and is a lt lighter. WARNING!! If you do get it loose, get omeone to help you getting it out! Those old tube-type things are VERY heavy, and you can get injured quickly. Ours weighed over 90 pounds. I got a couple of big guys after I got it all loose.
Noel and Betty Johnson (and Harry)2005 GulfStream Ultra Supreme, 1 Old grouch, 1 wonderful wife, and two silly poodles.