Question about LG 42LC7D-UB Television

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Lg 42lc7d-ub slow startup

When turning on, the green light comes on and the screen stays black for much longer than it used to. Finally after 1 min or so the screen lights up with the input selection and the cable box shows the set as available. Then it usually shows no signal, and then invalid format, and then comes on. I updated the software, but that did not help.

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Hello,

This is a very common symptom indicating the the filter capacitors on the power supply board are beginning to fail. These parts are used by the power supply to stabilize the power from the board but they overheat and start failing after a few years of use. If you can do a little soldering then you can do the repair yourself by replacing the filter capacitors of the board. Below you will see a picture of what the capacitors look like when they start to fail.

lg 42lc7d-ub slow startup - 12_7_2012_3_28_06_pm.jpg
And here is an article about failing capacitors:
http://www.ccl-la.com/blog/index.php/capacitors/

There are 9 capacitors on your board to replace and once they are replaced the unit should be as good as new.

Here is a link to information showing which capacitors your board needs and the locations of the ones to replace.
http://www.ccl-la.com/catalog/product_info.php?products_id=214

I hope this helps,
BuddyMc

Posted on Dec 07, 2012

  • William Davis Dec 22, 2012

    This solved it. I actually replaced the whole power supply board with a repaired one, and am planning on relpacing the capacitors on mine and selling it.

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Posted on Jan 02, 2017

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  • 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

  • 2318 Answers

SOURCE: My LG Plasma 42PC3D turns on and off repeatedly. I

Your plasma TV has a power supply 6709900019A. These power supplies failed due to defective capacitors. See the picture below and check the capacitors mark with the red lines. There are 10 capacitors that should be replaced even if they do not show signs of bulging/swelling on top.
The value of the capacitors is 3300uF/10V but you can use 25 volts as long as they fit in the space provided by design.


4c29d64.jpg

Posted on Sep 24, 2010

  • 3 Answers

SOURCE: only av input is working LG 42LC7D TV

I may put money that some one did stole your internal cable from the power supply to the main board !

Don't be surprised they did it to me at LG company .

Posted on Nov 15, 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

SOURCE: LG 42LC7D-UB, Bad LCD Controller Board????

Steve, that was awesome. Thanks a bunch. I already have the tools and I can get the solder easy enough. Thanks a again. I went to Best Buy this weekend and all they could say is that the entire board would need to be replace and that they really recommended a new tv as the cost for the new board would be as much as a new TV.... :( typical of them!

Posted on Nov 22, 2011

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Why 42 inch 42LC7D WANT COME ON


These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/

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

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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...


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Hello,

The problem is from the lamp of the television. It is going bad that is why it is always taking a while before the television turns on and the screen being dark sometimes.

Therefore replacing the lamp of the will do the work for you.

Goodluck
Elect_Comp

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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...


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Sep 25, 2009 | LG 42LC7D-UB Television

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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.

Mar 20, 2009 | LG 42LC7D-UB Television

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