I have a Grand Surveyor made by forrest river I have replaced the tv monitor twice it has bin winter storage for two mo. I went out yesterday to check it out turned the tv on and guess what the monitor would not come again after two years I finely found the prob. the 12 volt cable that goes from the wall to the monitor has a round plug on each end the one that hooks to the monitor the center hole is two big and would not make connection at times replace end with a smaller one and now it works like it is suppose to.
now that you finally got the monitor to work, give it some time; your Concertone receiver will break next.
I'm on my 6th Concertone AM/FM/CD/DVD receiver (ZX-550).
LOVE the Sabre, dislike immensely the Concertone by Forest River.
Good luck with yours.
2007 Dodge RAM 2500 Quad Cab w/6.7 Cummins
2013 Palomino Columbus 320RS
Reese 15K Pro Series manual slide
Firestone Air Bags
Champion 3500 genny
M.I.L still in the zoo! Yeah!