Question about Sony KP-51HW40 51" Rear Projection Television

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Red Horizontal Lines

The picture of my Sony 51HW40 recently started showing red horizontal lines. The lines are only viewable when there is a dark background in the picture, especially, when the background is black. I moved about 3 months ago and I'm wondering if the bumps and vibration of moving caused something to get out adjustment; however, the lines seem to have started about 6 weeks ago. Its possible they were there and it has just gotten worse. Any suggestions on how to fix would be appreciated? Thanks!

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Re: Red Horizontal Lines

These are problems with retrace lines. What you should take a look at are the settings for the convergence / retrace lines Basically you need to open the TV and the job is about 15 minutes to solve the issue with arched lines, either blue, greed, or red. There is a great how-to guide here:

Posted on Jul 02, 2007

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Re: Red Horizontal Lines

They gona get worse to dead circuit, a small capacitor (problably in the neck board) is bothering you, get a tech now that he can see the problem, gonna be cheaper now....good luck ps some times the picture say to the tech was going on

Posted on Aug 07, 2006

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Picture has red curved horizontal lines

This is a common problem. Its called a convergence failure.

Problem #1) Convergence


  • Screen Looks 3D
  • Colors wont align
  • Screen may look distorted

You can see some examples and find a fix here...

Jan 20, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Sony Projetion TV has horizontal blue lines across the screen

It is hard to tell from your description what is wrong--confirm actual model number for me.

I am going to attach some photos of what CONVERGENCE troubles look like--they may or may not look EXACTLY like your set but if you have something similar I can help you with more information.

If this helps you rate this solution as I do this here for free.





Dec 26, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

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:

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

1 Answer

Sony KP-51HW40 51 in. Rear Projection Horizontal lines

Don't waste your time - go out and get another TV. Chaulk it up to that we have all been scamed by SONY. They knew about the problem, did not choose to make things right. They have become the Fat Cat with the attitude that no one can hurt them. We need to show them that they are wrong and boycot their products. That is the only recourse we have.

Nov 01, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Thin red horizontal lines appear when viewing a dark background

Look around this sight the answer is explained here. you hace to take off the front speaker cover and a small panal undder it. you will find six knobs on a small panal. use these to adjust the settings fotr the power and they will remove the lines. You will need to have the tv on and I would sugest a normal size phillips head screwdriver not a power tool.

Jul 26, 2008 | Sony KP-51WS510 51" Rear Projection...

1 Answer


This sounds like you may have bad picture tubes. Most likely the green and red tubes. You would have to have them replaced and realigned. I would call a Sony ASC and get an estimate to verify this. An onsite service call could verify if this is what's causing your problem.

Jan 22, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Red screen

sounds like a picture tube problem its a problem that probably cant be fixed only by a professional

Nov 30, 2007 | Sony KP-51HW40 51" Rear Projection...

3 Answers

Horizontal Lines

sounds like you are seeing retrace lines. you will have to adjuste the screen control. (it would be like a master brightness.) you will have to removed the front bottom plastic from the tv, look for 2 to 4 screws. then gently remove the front. sometimes the also add velcro to help hold it in place. now you need to remove the small plastic or wooden panel/door. in the upper right side you will see a small box with 6 controls.i do nor remember if the top 3 controls are for screen or focus, use a flashlight it is marked on the box which is which. adjusted the screen control to the left slightly to decrease the color you need. the green is the center control. like you said it is more noticable on dark screens, so try & adjust it in a dark romm with a drak seen. good luck.

Jan 02, 2007 | Sony KP-51HW40 51" Rear Projection...

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