Question about LG 42LC7D-UB Television

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LG 42LC7D-UB after few minutes the sound goes off and channel change by itself

After few minutes the sound goes off and channel change by itself , there is no way to turn volume back up, or stop the channel change other than turn off the TV for a while.

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When heats up, the supply voltage from the main power supply board goes less. Check all the soldering to this board for any loose solder terminals. Resolder all the suspected solder terminals by applying a little more solder. If it do not help you, replace the board as card basis.

Posted on Jan 09, 2013

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Posted on Jan 02, 2017

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  • 3 Answers

SOURCE: LG 42LC7D TV does not want to chg channels after 5 min of use

There are some inductors that are out of spec. LG's original SB said to replace some of these with a jumper, but it only lasted a couple months.

You need to have the Total Main Assy replaced.

Posted on Jul 30, 2008

  • 1294 Answers

SOURCE: my LG tv started turning

Please descativated the on timer or off timer selection.

Posted on Sep 07, 2009

  • 10 Answers

SOURCE: My Lg 42lc7d 42 inch flatscreen tv has no sound

1- check all the cables that are hooked up to the TV 2- try to get audio to and external speakers or home theater (to check the sound card). 3- if the step # 2 don't work either you have a bad sound board on your TV. 4- opn the TV try t get the part # of the board, and replace it

Posted on Feb 20, 2010

  • 1 Answer

SOURCE: No Sound, No Picture on LG 42LC7D

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

Posted on May 25, 2010

  • 679 Answers

SOURCE: I have the exact same issue as the unsolved

The power on problem is a cap in the power on circuit. The loss of signal for an areal is delayed. Nothing you can for DIY.It needs repair shop visit.

Posted on Feb 12, 2011

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1 Answer

Tv powers up but no picture. before it wuld take a few minutes to come on but now it doesn't?


sounds like the tv has finally broke, power board may have finnaly bit the dust, need to find some one who will work on it for you

Mar 02, 2015 | LG 42LC7D-UB Television

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Error on start up


Do you have sound when the screen goes black?

Nov 02, 2013 | LG 42LC7D-UB Television

1 Answer

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.


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

Apr 03, 2011 | LG 42LC7D-UB Television

1 Answer

I have the exact same issue as the unsolved problem below on this page: I have a LG 42LC7D that is about 3 years old. A Problem with the LG 42LC7D-UB Television I have a LG 42LC7D that is about 3 years...


The power on problem is a cap in the power on circuit. The loss of signal for an areal is delayed. Nothing you can for DIY.It needs repair shop visit.

Feb 12, 2011 | LG 42LC7D-UB Television

1 Answer

42LC7D-UB Shuts off


re place the capacitor from the power supply of the t.v.

Sep 25, 2009 | LG 42LC7D-UB Television

2 Answers

Cuts off


Most likely the power supply board.

Lie the tv down on a bed and unscrew the back. Its only about 9 screws around the edge and look at the power board, on the left, see if theres any burn marks.

I have a brand new board I bought the other day for the same issue but before I replaced it, stupidly, I checked with LG and turns out mine is still under warranty so I'm stuck with a new board.

Let me know if you want it. I'll match any price you can find online.

Mar 20, 2009 | LG 42LC7D-UB Television

1 Answer

Lg 42lc7d turns on to blank screen doesnt respond to any request


I need sreen for LG 4LC7D-UB because the screen is damaged

Mar 16, 2009 | LG 42LC7D-UB Television

1 Answer

Replace main board on LG 42LC7D-UB


not sure what you're referring to as a "main board", but heres the LCD Control Board for the TV

http://cgi.ebay.com/LG-42LC7D-UB-LCD-CONTROL-BOARD-6870C-0119A_W0QQitemZ150277759127QQcmdZViewItem

Mar 13, 2009 | LG 42LC7D-UB Television

1 Answer

LG 42LC7D TV does not want to chg channels after 5 min of use


There are some inductors that are out of spec. LG's original SB said to replace some of these with a jumper, but it only lasted a couple months.

You need to have the Total Main Assy replaced.

Jul 28, 2008 | LG 42LC7D-UB Television

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