Originally Answered: What does it mean when your TV has a black screen but is still producing sound? Unplug the power to the external device for 30 seconds. Disconnect the HDMI cable from the TV and move it to an alternate port. Plug the device back in, and power the device back on.
https://www.quora.com/What-should-I-do-if-my-TV-screen-is-black-but-there-is-sound
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: picture for 1 second then screen goes blank but still have audio
i have taken the tv to repair shop a circut board has went on it
SOURCE: JVC LT 42x688 no picture just sound
Sorry, this has no easy fix. The good news is you do not need an LCD Panel. The bad news is the Video Processor has a problem.
This TV has x3 Boards. The one you should replace first is the one in the middle. If this doesn't fix it, try the one on the right. The Part #s are on the Boards if you wanna try ebay.
SOURCE: was watching tv all of sudden screen turned black, with audio...
i was watcing tv afeter a while i realized there is no picture but we have sound
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