Question about LG 42LC2D 42 in. LCD HDTV

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LG 42LC7D TV won't turn on. green light blinks 13-14 times then stays green but TV doesn't come on, no sound or picture

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dsacco86
  • 1077 Answers

SOURCE: My LG 42LC7D, when I turn it on, Blinks twice,then turns off

Sounds like it started "Protection Mode" because of a failed electronic part inside the TV. When this happens, the TV will keep turning itself OFF or will not turn ON at all. This keeps the other part inside from being damaged. Most likely the TV has a power supply related problem. It's possible that it maybe a bad capacitor or transformer on the power supply board. The common part to go bad for flat panel screens circuit board that powers the screen. Most manufactures call it a Backlight Inverter Board.
But, I can't say it's 100% the problem because I can't actually look at the tv over the internet. I can only make guesses with the symptoms.

You have a few choices:

1. You can again try leaving the TV unplugged for 30 - 45 minutes so the TV can discharge and reset itself.
2. If by chance the TV is still under warranty, go that route.

3. If you have some electronic experience, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, schematics, test points, and part# lists.Usually, cost under $20. And most cases the new part cost less than $15 by searching on the internet with the part number.

4. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV.


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

Posted on Jul 20, 2009

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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

  • 14 Answers

SOURCE: LG 42LC7D.......Have sound but no

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

  • 8 Answers

SOURCE: power button is green - no blinks / no picture / no sound

Unplug it from the wall, wait 2 minutes and plug it back in. if problem still exists, its probably the main pcb.

Posted on Aug 21, 2008

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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1 Answer

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/

Nov 06, 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

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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

2 Answers

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

Nov 27, 2012 | LG 42LC2D 42 in. LCD HDTV

1 Answer

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.

Nov 11, 2011 | 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

2 Answers

No Sound, No Picture on LG 42LC7D


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

Dec 27, 2009 | LG 42LC7D-UB Television

1 Answer

LG 42 LCD no sound or picture


Did anyone find out the solution for this??????? I have the exact same problem with my LG 32 LCD. I only had it for a year and a half, and the green light blinks a few times and it shows no picture. Not even a red light when the tv is off. The same thing happened a couple weeks ago and by some miracle it started working again.

Jan 28, 2009 | Televison & Video

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