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Most of the time it will involve replacing the entire board that connects to the HDMI and outputs associated with it--not a cheap fix and good luck finding any board for this brand set.
If DVD input works likely a issue with the signal.
If using a cable or sat box or even a receiver inline--unplug each and after several minutes plug back up to allow each unit to try to reboot.
If using component connections from box or receiver they may be the issue or not. In that case if a box is feeding signal via component or even HDMI the box (if reboot does not fix this) may be bad.
Another simple test if cable is used with a box is disconnect cable going to the box and connect directly to set--that way you will know if box is or is not the problem.
You have problems with your inverters. Inverters will light the screen. In your case I believe this will solve your problem!......But in the event you moved your cable connections to install a DVR or satellite box or high def box, See if you may have improperly misplugged the yellow cable. A common fault by do it your selfers! Please check this before you see a TV tech!
Mine did the same thing once. I think all I did was hit the setup on the remote, and let it run back through all the channels and then it worked just fine.
HDTV is not carried via coaxial cable from tuner, you need HDMI or the 5 RCA cables that are different colors. I forget if they are called component or composite, I think they are called composite, the R and W are sound. If you run the HDMI or composite cables to your TV, there should be a variable out or audio out on the back of the TV that outputs ANY sound coming into the TV, like Wii, DVD, tv, etc. So if you want to listen to tv sound, just pipe the audio out to the receivers available input and turn it up. Cant be used with mag input (turntable) all others are compatible. Did this answer your question? Sat cables are usually kept under 130 ft from the dish, and the dish receiver can output coaxial signal over 400ft on RG-6 cable. HDMI is limited and can get very expensive. Does your sat box have a coaxial digital out (orange RCA) you can use that if your receiver can read it, usually associated with the DVD input or video input, but only for digital encoded programs.
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