It sounds like your power source module is defective. I suggest you try to replace it from one your might find at a second hand store. Look on the back side of the power source device. It should list the output voltage (usually DC or direct current as opposed to AC or alternating current) and also lists the current in amps that it produces. Also inspect the connector to your TV so you can try to match the connector when you buy a replacement. Armed with that information (output voltage and current ability from the power source) pick through the modules you find at a second hand store. Make sure the voltage exactly matches. You can also purchase a power module which can produce more amps of current, but never less. If you are successful in finding a match, buy it - but you may need to cut off the old connector and some of the wire that plugged into your tv so that you can reuse the connector on the used unit you just bought. You will need to splice the old wires from the tv connector to the wires coming out of the used power unit. Assuming the connector on the used unit you purchased did not match your tv connector, you will also need to cut off the connector and splice the tv connector to the wires coming out of the used power unit you just bought. If this is too complicated, go to the manufacturer and try to buy a replacement or look at other places like eBay for a matching power unit to the original TV unit.
There is a possibility your TV itself has a short and is defective, although from you comments I think it is more likely you power source unit.
on Jan 23, 2018