Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
SOURCE: After power outage, TV screen is blank
It sounds funny but, unplug the set for 30 seconds to allow the TV to reset then see if the problem still is there.
SOURCE: JVC LT-23X475 flat screen TV
capacitors are most likely to blame here, there are several that most likely are on the power board and are blown if you get them replaced the tv will function normally, the heat can come from the transformer since it is not getting smooth power from the capacitors. it is working very hard to dump the spikes in the electricity. I ups backup power supply rated for the tv's wattage will help smooth power and protect your investment.
SOURCE: Picture blacks out after a few seconds after turning on the tv
Anytime an LCD has a shade of pink, that means the CCFL lamps are about to go out. Now that you have a black screen, I'd say you just need some new bulbs.
SOURCE: JVC LCD TV LT-42X688-powers on, blank screen. no picture,no sound
You most definately have bad capacitors in the power supply. try and get it repaired as soon as possible, not an expensive repair that iv'e seen.
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