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By your description it is a high voltage problem, the horizontal output transistor is probably shorted and is loading the set down which would explain the constant clicking it is making. To repair this will more than likely run what you paid for the tv. But! if you decide to go ahead with the repair then an estimate would be in order because there may be other issues. My personal feeling would be to quit while you are ahead.
There is a fuse on the DC power line for AC/DC sets and you can start by making sure it isn't blown. The fuse may be in the cigarette lighter plug itself, or inside the TV. If you find the fuse blown, replace it with one of the same value and try it again. The fuses sometimes do go for no good reason. If there is some internal trouble with the TV, the fuse will go again and you'll know for sure.