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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.
This is an RCA part but can be used on nearly any TV where the connector has been ripped off. (Make sure to use a soldering gun when soldering the new connector to the metal shield in the TV. The small iron you would use for other connections won't get enough heat into the connection.)
You will need to go back into the menu and see what ia available in the video input mode. You may have switched the type of input you can use such as default or componts ect. If you have an isntruction manual, look in there or call the manufacturer, should also be in the instruction or user manual. Good Luck