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I have a 42" LG LCD TV and just experienced this today. Watching cable,
then the screen went to black, but audio continued. I pressed the guide
button on my remote and pic came on with my guide menu. But then went
to black again 10sec later and has remained that way for nearly an
hour. Tried switching off both cable box and TV, disconnecting and
reconnecting cables, but no luck. Finally unplugged mains, waited a
minute, then turned back on. Everything seems normal now after the
1 check remote control.
2 tv comes to stand by to protect itself
3 there might be problem in power supply section
4 & if it is ok check horizontal section.
5 call skilled tech to fix it.
6 it is not a major problem.