Question about LG 20LS7DC 20 in. LCD TV

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No picture LG 20LS7D

Help ! Soukorus, anybody, No picture on this thing. What is the easy solution?

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  • klothman Jun 28, 2009

    Thanks for replying. Power light is on, using button on tv to turn on, sound OK, connected to large outdoor antenna and new dtv converter box, it's on because it worked on another set.

  • klothman Jun 28, 2009

    Also, socket is good, sound but no picture, completely black, No menu, used to have a thing that would come on screen and tell me what channel I changed it to, that is not there when I change channels, I change input, no picture, black. Thanks again for helping.

  • Handy Jeff May 11, 2010

    First rule of electronic repair: Is it plugged in? That means, is it getting power? Is there a light or other indication on the set that lets you know that? Or is the set completely dead? Are you using the remote to turn the set on? Maybe the remote is dead. try using the power and other buttons on the set itself. Is the power socket providing electricity? Plug in a lamp to be sure. If no picture, do you mean a completely black picture, or just no TV picture. If you press "menu" does it display a menu? If there is no TV picture, is there any sound? Are you sure the antenna or cable is connected?

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2 680u/25 caps explode in the p.s. caused by underrated power MOSFETS. Replace the caps.

Posted on Apr 01, 2010

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Most likely the tv has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

Posted on Jun 28, 2009

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When I turn the TV on, the LCD backlight briefly energizes, then goes out. I can hear the audio on my TV, but can't see the video. I took a flashlight and placed it up against the LCD screen and I could see the video. Make sure you are not in a bright room, as this might make it harder to see the video using the flash light. This doesn't help much, but I can't imagine the light bulb is very expensive, I think I will take it to get serviced.

Posted on Jul 09, 2011

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I agree, it does sound like a problem with the fluorescent lights that light up the screen aren't getting power. The other thing could be something wrong with the circuits that convey video to the screen.

BUT -- if all was OK until you hooked up the digital converter box, maybe that is set incorrectly. Even so, I would expect the channel numbers to appear on the screen when you change chanels, and a menu to appear when you press "menu".

If you were knowledgeable enough to fix the black screen problem by ordering a service manual, I don't think you would have posted a question to start with. You probably will need to have a pro fix this. My guess is that the cost will be $100-300.

Posted on Jun 29, 2009

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