Question about LG 42LC7D-UB Television

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


I have an LG 42LC7D just started doing the following

I can turn on the TV with the remote and then change channels without a problem. Watch TV for about 10 minutes then I CAN NOT use the remote to change channel nor to change volume. Went up to the TV and tried to change channels or volume from panel does not work either. Only on and off button works on the panel. The sound and image on the screen is fine. Shut down the TV for the night and tried again the next morning and same problem.

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  • warp10to6 Oct 09, 2008

    My LG 42LC7D usually "locks" into a volume down command. You can force the volume up by pressing and holding the volume up on the set but when you release this button it immediately steps back down in volume until it it is back to zero. When in this "locked into command" mode it is very hard to get it to do anything else. It will , for instance, completely ignore all inputs from the remote control. I have been able to force it into a different "loop". I have been able to get it to change to doing a channel up command which again it "locks" into and displays ascending channel numbers at the top left of the screen. I have also been able to force it to display the menu and here it "locks" into a scroll up command. It's driving me crazy! It is such a richly featured set and the surround sound from the TWO SPEAKERS is amazingly good. Yes, it did work beautifully for the first 24 hours. Can't LG phone the people in China who no doubt designed and built the motherboard and get some help???

  • wellsjr Feb 25, 2009

    I have the same exactly the same problem with my LG 52lLB5D. Support told me there might be something wrong with the remote auxiliary conector in the back panel. Allthough I have not replaced the main board yet, it looks like this will be the only solution... bummer.

  • Anonymous Mar 17, 2014

    I have a toshshiba flat panel and I have an unknown timing problem just on one channel on antenna tv. All the other channels work. I was watching channel 9 and it just stopped. I did a channel scan and picked up all the channels again but it still will not work. I made no changes to the tv.

  • Anonymous Mar 23, 2014

    my tv at first used to take to long to turn on, but now doesn't turn on at all,

  • Anonymous Mar 28, 2014

    Remote will turn tv on and volume up and down but will not change the channels



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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


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

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.

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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.

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