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Are you connected to cable TV using a digital receiver? If so, your TV can only get the signal for one channel - the one you're tuned into on your receiver. A workaround is to connect the coax cable TV cable directly to your TV, as well as connecting your receiver to your TV. This will allow you to be able to change the channel on your receiver and be able to change the channel on your TV to one of the analog channels you can tune into by connecting the coax cable directly to the TV.
It could be that the picture tubes have gone down on emission, there is a prcedure that can be tried to bring up the overall brightness but it is just possible that you will loose some picture quality. If it's a 1994 projo tv i am thinking of the three crt system, a gray scale alignment would probably correct the dark condition in your picture, again depending on how far gone is the emission in your picture tubes, if your projo tv is the dlp system, the bad news is that you could be needing some light engine repair. The color adjustment is possible with the availability of a service manual or in the case of the dlp system, light engine repairs or replacement are available from some on line stores.
Has Lamp been replaced? Also if Blaster board is bad Lamp will not turn on also CK Fan behind Lamp If it is not running Set will not turn on For Parts Try Encompass 1-800-639-3328 or look on line www.Encompass Parts, Also Look on E-Bay for Lamp and Blaster Board I found Lamp fot mine for 85.00 and blaster board for 55.00Type in Model number it will be on back of your TV.
Sounds like a power problem to me. Possible shorting out inside the tv. If its old I would recommend discarding this tv. The price of repair costs are really high for TV's. You can probably upgrade to a flat panel for what the repair cost would cost you to repair this older tv.
Does it turn off and on as if you were pressing the power button? Or does it happen really fast? If its happening as if you were turning the tv off and then having to wait for it to come on again I would say its the power supply which is probably going to cost you hundreds in a repair shop. However you could possibly find a power supply for it on ebay buy searching for the model number and brand in the search area of ebay. Putting a power supply in a tv isn't really that hard, unless there is something in the way to get it in or out of tv. Usually it just involves unscrewing it from the chassis and unscrewing the hot wires and ground from the supply...then putting the new one in and screwing them back down.