Question about LG 42LC7D-UB Television

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LG 42LC7D.......Have sound but no picture at all. Light goes from red to green and sounds as though the screen tries to turn on but no picture.

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It sounds like you have a logic board problem. It is easy to fix open up your tv on the back and the logic board should be covered with a small metal plate unscrew the it, it uses small screws get the number of that board an order it through guytvparts.com is the cheapest

Posted on Apr 03, 2011

  • reboat Apr 03, 2011

    guytvparts.com does not seem to exist?????

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1 Answer

I've a LG model 42LV3730, it has no sound and no picture. The ON light switch on a while then off.


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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Could be a couple of things.
The good news is that the LCD panel is working, albeit briefly.
It definitely sounds like it's repairable, though.

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Error on start up


Do you have sound when the screen goes black?

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LG 42LC7D turns on ok but no display or sound,tried using monitor out with another tv but no picture either


Check to make sure you have the right input selected for the input that ou have plugged into.

Jan 20, 2013 | LG 42LC7D-UB Television

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My LG 42LC7D tv wont turn on. The green led lights but no picture or sound


There could be several things going on, I would start with having the power supply checked. I've worked on several LG sets from that time frame that all had bad capacitors in the power supply causing all sorts of issues

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Hard time turning on tv. I turn it on, green light flashes a few times then becomes solid green. No picture or sound. I turn it off and light becomes red. I do this at least 5 times before tv will come...


There are some capacitors on the main boardthat are low quality. You can buy a capacitor repair kit on Ebay that contains a set of capacitors to replace the offending ones - about 15-16 bucks. I soldered in the new capacitors and the TV has worked perfectly since.

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I do not have a solution but I have the same situation with my tv

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