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Disconnect your speakers when unit off and cold. Turn unit on and wait. If unit stays on, check speaker wiring for damage. Connect one speaker at a time with unit off and retest to find either a bad speaker or output channel problem. Repair speakers and wiring if found, or take unit for service, you have an overload problem.
Sometimes empty/unplugged channels introduce noise to the amplifier. You can always try to connect all of the input channels to some external mobile phone/mp3 player, etc. and then set these equipments to the minimum possible volume (mute if possible). This should remove the "atmospheric" audio noise.
You DO NOT use "Channels" to View a DVD player it usually connected to the AV External input. via AV, Yellow, (Video) Red & White, (Audio) or Component Video, Blue, Red & Green. (Video) + Red & White (Audio). These are selected via the External Inputs.
I do not have a Zenith B25A02Z TV. What I do have is a 1988 Zenith Color TV SE2517P. I called a local tv repairman and discussed the problem over the phone. He can take a look at it if we bring it in (service call to the home cost $100 just to show up). He said it was worth fixing since he thought it was only the sound. We have a great picture. He charges $20 to look at it but we have to leave it. He lives 20 minutes away one way. We think it is worth the trip if we can get it loaded into our minivan. We live in western NY where the weather can get pretty ugly many days. I will post the solution later when I know. FYI
Since not all devices have the same in/outputs available, if you are trying to interconnect them, it helps to know the make and model of both, not just one.
There are several possibilities to connect external devices to your 'home theatre' system.
The one we have delivers the best when S-video is used but that requires a separate path for sound.
The standard colors for audio in and outputs are red(=right) and white(= left) and often cables are supplied with the same color coding.
The usual connections will be named 'Line in' and 'Line out.' The outputs deliver specified voltage into a specified load (or termination) and the inputs expect that condition.
This ensures that volume controls act in a sensible manner.
Unit was working fine,took a movie out,put in new one,but would not play.Tried hitting open button ,unit will not respond,all other functions working ok.
What could be the problem,is it worth fixing?/Is there a reset button somewhere on unit?