Already fixed on my 26rr I brought home yesterday. You really have to put the unit to see what is going on behind. For mine all I had to do was move the yellow on the back over one connector. They had it plugged into the port for the subwoofer? Also the ceiling jacks are weird how they are setup. The red and white are wired to aux in on the back of the unit. So you have at least two options.
Option #1 - leave red and white as wired and from audio out on tv run to the red and white ceiling jacks. Yellow from ceiling plate goes to video in on back of tv (DVD video out on unit) This plays all sound through ceiling speakers both dvd and when using antenna.
Option 2 - As others have suggested you switch all 3 in back of unit to DVD out. Ceiling plate then gets wired to yellow white and red video in on back of tv. Sound for DVD would also then play through ceiling speakers and tv speakers but antenna will only play through tv speakers.
Really don't understand why it was wired wrong to not work in either configuration to begin with. I also don't understand why one video out connector has an adapter from an rca yellow video to a coaxial cable. I didn't mess with it but something I have never seen before.
I wired mine for option 1
Switched one wire on unit for option 1