Question about LG 47LC7DF 47 in. LCD HDTV

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47LC7DF The green light goes on when I power it up, no other response. No picture or sound on ANY input. There is a delay of 5 to 10 seconds when powering on or off. Set is about 11 months in usage now. No problems noticed until today.

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  • programmer04 Jan 05, 2009

    My TV (exact same model) was roughly the same age when it started doing the same thing. I bought it at the end of January and the problem started around Christmas. Normally, the power light would flash green about 5 times before the picture and sound came on. Now, it flashes 18 times and all I end up with is the back lights on but no picture or audio and it takes several seconds to power off. It can take anywhere between 20 minutes to over an hour of turning the TV on and off before it starts working again. I unplugged it for a few minutes to reset it as an LG Tech suggested, but it didn't help. Now I'm afraid to turn it off as it might not come back on. I have about 3 weeks left before the 1 year warranty runs out, so I guess I'll have to go that route.

  • Anonymous Apr 23, 2009

    I have the same problem with my LG 47 inch. It is still under warranty, so is it best to have a tech come out and replace whatever is causing the problem or does removing the power overnight take care of the issue? I don't want a temporary fix that will recurr if I don't have it taken care of with new parts. What do you think?

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When problems arise that kill both video and audio, it is normally related to the failure of the main power supply.
Nearly all modern electronics uses a 'switched mode power supply.'
They are more efficient while being much more complex and prone to failure but offer the added benefit of being designed so a 'downstream' fault will cause the supply to shut down to avoid setting fire to your home.
The supply itself will also cycle if it has an internal problem; once again, to prevent destroying itself or anything dependent on its outputs.
 
Supplies built a couple decades ago could only do this by blowing a fuse and there are conditions that can occur that would not blow the fuse but would allow overheating and further damage as well as fire.

You might try the following: Pull the AC plug from the wall and ignore the set for a day or overnight, then plug it back in.
There are literally millions of semiconductors in a modern TV receiver and sometimes, they trip and lock themselves up.
When that happens, removing all power from the unit will allow everything to return to a stable state and function as designed again.

If that doesn't help, I hope your set is still under warranty as this could be a multiple hundreds of dollars to repair.
The power supply is often on a separate board and unfortunately, component-level technicians aren't that common anymore so frequently, the board is replaced and the old one discarded.

Posted on Sep 14, 2008

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