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I have red horizontal lines across my entire screen. The lines are noticable. However, I still have a clear picture.

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  • M4rw Apr 08, 2008

    I have the same problem (i think)
    Here's a picture of my tv with the red lines:

  • csfstryker Apr 14, 2008

    Horizontal red line on top of any otherwise clear picture. The lines are a the top anf the bottom, while the middle is w/0 lines. The lines are bad when the set is first turned on, but they get better as the set warms up

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I fixed my problem: it was the screen voltage.
To (try to) fix it: open up your tv, look for a thing like this:
I have red horizontal lines - 3ee50f1.jpg
As you can see it has 3 control-screws. one of these is for the screen (it has the text 'screen' near it), turn it slightly to the left to reduce the voltage, and the lines will probably disappear.

Posted on Apr 16, 2008

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Posted on Jan 02, 2017

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1 Answer

So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...


To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

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Screen is red with lines when channel is changed


If its a kp-51hw40 : go to an unused video input and look at the screen---if it is redish in the background with curved faint trace lines you have one of two things wrong; First: the red "screen" control may be set too high. Second: you may have a problem with the RED picture tube.


To try to adjust the RED screen down you have to remove the entire front grill plate on the front of the TV(some have screws on the back on either side that have to be removed---and then you should be able to pop it out. Behind it there is a masonite inspection plate held in with screws----Once you have that off look for a SMALL SQUARE BLACK PLASTIC BLOCK; it has 6 black adjustable controls---you have to use a flashlight and look carefully---one row left to right will be marked FOCUS--DON'T TOUCH THOSE---THE OTHER ROW left to right will be marked SCREEN; if you look carefully you will see marked by each r (red) g (Green) b (blue)
you want to locate the RED SCREEN CONTROL.

WITH the set still on a blank video input where you can see it clearly turn the RED Screen Control to the left until the lines and red tint go away---do this slowly and make sure you are adjusting the RED screen--not the FOCUS.


IF this has been helpful give me a vote here as I do this for free; yesterday I adjusted one of these in a home that was blue with the faint lines---about 15 minute job for me.

if you have questions or need help:

etower.766@netzero.net

Aug 23, 2009 | Sony KP-51HW40 51" Rear Projection...

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Here is a picture of my TV problem, the green horizontal line is from the camera flash. thanks for the help.4d2ca33.jpg

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Always try your extended warranty!.....Probable cause = bad
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Very fine red lines across srceen


It is an adjustment, but it's an adjustment you may not want to do. It's the red screen control. It's located behind the front panel so the entire front panel has to be removed in order to access it-which will expose you to hazardous voltages. if you like, I can post detailed instructions on how to get that front panel off, it's kinda tricky.

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