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If the transformer puts out a simple 12 Volts regulated at 5 Amps, you should be able to go to any electronics parts distributor and order a regulated power supply at the mentioned specs. There are models that come enclosed with terminals on them. You can also buy the supply raw, wire the AC cord to it, get an enclosure for it, and wire the the 12 Volt output side to the TV as necessary.
If you are not experienced at doing this type of work, find an electronics type person to do this for you. If you confuse the polarity to the TV set, or not select the proper power supply, you can damage the TV set.
These power supplies are not very expensive. A new low cost one can cost about $60 to $80 US depending on the model type and rating. Professional high quality type supplies can cost a lot more.
Sometimes these supplies can be found slightly cheaper from electronics parts surplus dealers. I have seen them sold surplus for under $20.
The power supply has been compromised, if you are very lucky the fuse needs to be changed, in order to check this, remove back cover and follow the power cord to the power supply, see if you can find a blown fuse, replace to see if it will power up, if not probably more cost effective to replace monitor.
You can purchase replacement LCD monitor power supplies in numerous places, for example on eBay or in online shops. You can ask a seller to assist you in selecting a proper one. The most popular specs for such monitor supply would be 12V and a minimum of 5A current rating; the higher current rating on the PS the better, you will have more reserve.
This is very likely a bad power supply inside the monitor. A person with technical skills could replace all the ELECTROLYTIC capacitors in the power supply and likely solve this. ** hazardous voltages inside. Technical person only.
You need to look at the back of the monitor for the voltage (DC) and current (in Amp) requirement. You have to get the right voltage, but the rating current of the power supply can be higher but not lower, i.e 12vdc 5amp power supply can be used in place of the 12vdc 4amp supply.
Then you need to find out what type of DC plug is needed, most monitor uses what they call barrel type, most common are 5.5mm OD x 2.5mm ID, or 5.5mm OD x 2.1mm ID.
possibly a power surge killed the main board in the LCD. if the fuse was blown i would suspect a power surge. you could replace the circuit board. either that died or the power supply died- depending on if it has internal or external power supply that might be blown as well.
i would take it to a professional LCD/ LAPTOP repair person. they should be-able to test it and let you know what needs to be replaced
The monitor needs a power cord and a signal cable. The power cord is a standard 3-prong detachable cord just like the one on nearly every desktop computer and many other electronic appliances.
The signal cable may be one of two types, depending on your computer's video connector. The monitor has connectors for both VGA (a D-shaped connector with 15 pins) and DVI (a rectangular connector) inputs. You need a cable with whichever type of connector fits your computer.
You should be able to find the power cord at Radio Shack, any of the big office supply places, or retailers who sell computers. The signal cable may be available there as well, or you can order from a number of online vendors.
The monitor also allows you to plug in a USB cable from your computer so you can plug in USB devices like a keyboard or mouse. For that you need the same kind of USB cable you would use to connect a printer.
You can view or download a copy of the monitor user's guide at Dell's site here: