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these adapter pin is available in all electonic shops and you can get them to suit your TV .
If you want the DVD to work in the cigarette lighter socket then attach the make adaper to the set with the correct polarity.
If you want to use it at home then you need the dc adapter with the current factor of about ( 12 V/5Amps) to suit your set.
I hope that is what you meant.
You simply need a DC - AC Inverter, these can be obtained from somewhere like Radio Shack, or the like, pretty cheaply. These convert 12V DC into 115/120V AC (Some are 24V - 115/120 V) for use with your household appliances.
You can get them from 100 Watts to over 1 kilowatt (!000 Watts) They can be used on almost anything at all, except things with big motors in them. Then you can simply plug the AC adapter into the inverter and you are good to go. not having to worry if your laptop is getting correct power.
Often the DC input into a laptop is between 14 Volts DC to 22 Volts DC and a high current too, up to 5 Amps. So the inverter is your best option.
Anyway you would need to use at least TWO 12 Volt batteries and then you would have to make it the exact voltage the laptop needed.. if it was say 19V then you are still going to have to find a way to drop the 24 V to 19 V, anyway so.....
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.
I would check on the inside for a disconnected wire or loose connection at the Dc imput if it still works on ac. You can most likely get a service manual at http://www.servicemanuals.net/ if the wires are intact on the DC imput and the jack itself fits secure to the adapter. Hope this helps
Most devices are Negative to Earth, Chassis and Positive to the Center Pin on the "Adapter". So probably any 12 - 14 Volt say 4Amp well regulated, or Switch Mode power Supply probably would power your unit..
If you don't know the exact voltage Start at about 6 Volts and work up until it works correctly.. I often use a switchable power Supply to find the right voltage and then get a fixed supply to suit.