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Hi, when i turn on my tv model number (42lc7d-ab) i have no picture or sound. thanks

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I would suspect the power supply is faulty:

I would try to look on the power supply first for popped capacitors that supply the 24v rail for the backlight inverter.

If you repair the 24v line on the power supply and check the 5v feed also going to the BN_on (on) the backlight inverter and you still have no picture...you will also need a new inverter.


Hope this helps! Please rate

Posted on Mar 14, 2011

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I have a lg 42lc7d with sound but no picture. There actually is picture for 3 seconds, and then it fades away.


Check and replace the back-light inverter board. If you wish to get more details, check the site linked here.http://electronicshelponline.blogspot.com/
Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window.

Oct 10, 2013 | LG 42LC7D-UB Television

1 Answer

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

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

Hi my tv wont turn on. No picture. Just a sound like a buzz. just a black screen.


Hi,
Model number and brand of tv will help us to understand what kind of tv you have and what could be possible reason of problem for buzz sound when you turn it On.
Without tv model number and brand info, it is not possible to suggest any thing because many kinds of tvs are being used.
Thanks.

Apr 27, 2011 | Televison & Video

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

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

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

Nov 11, 2009 | LG 42LC7D-UB Television

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