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If the problem is same with different input devices and you have ensured there are no loose contacts in power outlet, RC jack, cable and sockets, the TV needs servicing.
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Sounds like your screen went bad.
Close the lid, attach an external monitor, open lid and see if the screen appears on the monitor.
Resetting the PRAM may do the trick also:
You reset the PRAM by rebooting a Mac and then immediately hold down the Command+Option+P+R keys, you will then hear the Mac reboot sound again, signifying your PRAM has been reset. You must hit the key combination before the grey screen appears otherwise it won't work.
Wharfedale LCD3210HDAF this tv was working fine the night before ..
when i turned it on in the morning the screen came on then instantly
went blank .. although the sound is fine i am unable to get any on
screen including menu an volume information and of course can any one help ??
we had a similar problem on our 40 inch samsung , the screen went black but we could still hear sound on ours it turned out to be the main board not the inverter like some people liked to think thanks
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