Question about Sony KP-51WS500 51" Rear Projection Television

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Very fine red lines across srceen

Hi, Our set has very fine red lines going horizontally across the entire screen. they have a slight curve to them.When the picture is adjusted using the DRC from interlaced to progressive the lines become further apart.The picture quality is great. Nice and sharp, the color is equal all over and can be adjusted by the hue and color buttons. But there are those red lines, very fine but annoying. Especially when the background is dark.Is this an adjustment we don't know how to do or something going wrong that would need a repairman to fix it. Thanks D. Brant

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Re: very fine red lines across srceen

The initial reply is correct, you need to try 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 with step-by-step pictures here:

Posted on Jul 02, 2007

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Re: 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.

Posted on Jun 13, 2007

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Hello, I've got red wavy lines across screen

There are two common problems with these sets.

Problem #1) Convergence

  • Screen Looks 3D
  • Colors wont align
  • Video may look distorted
Problem #2 CRT Fluid has clouded over. Symtoms
  • Dull looking video
  • White looking video
  • Halos around objects
  • Red/Orange looking video

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


Oct 22, 2009 | Samsung HCM5525W 55" 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

Horizontal blue lines with a slight blue wash in the screen

Its because of Over Voltage of Screen (G2) to Blue CRT.
Take off front lower cover (speaker grill) and unscrew board. There you will need to find Focus Block mounted having 6 control knobs. 3 knobs are for Focus control and 3 are for Screen volts control. Find Blue Screen control knob and turn is Counter Click Wise slightly until bluish shade disappear on screen including few blue horizontal lines.
If you select AV input to adjust that will be fine as you do not need to wait for dark-scene.

Apr 09, 2009 | Sony KP-65WS500 65" Rear Projection...

1 Answer


hell yeah,
the biggest mistake I did with this tv.all tubes need to be replaced and it burns a hole in ur guarantee on tubes,sony aware of the problem but didnot recall these defective sets.
good luck.

Oct 27, 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

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

I fixed my problem: it was the screen voltage.
To (try to) fix it: open up your tv, look for a thing like this:
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.

Apr 06, 2008 | Projection Televisions

1 Answer

Thin red horizontal lines across screen

While looking at your TV, remove the bottom right speaker grill. There you will find a cover held by a couple of screws. Remove the screws and behind the cover you will find the "focus pack" which is a group of 6 adjustment screws. The top screws adjust (in order from left to right) the brightness of Red, Green and Blue.

What you will do preferably at night (or with the room dark) turn the top left adjustment screw (Red) all the way to the left and then gradually turn it to the right until the point you can see the retrace line and then turn it slightly to the left until the retrace line disappears. That's it! You can do this for all three colors - if need be. These do go out of adjustment every now and then. The 3 screws on the bottom are to focus the colors individually to minimize "bloom" on the screen. It's best to be in service mode on your TV when doing this OR open up the cabinet and cover (with something) the other 2 colors while you adjust the focus of the color you're adjusting.

Good Luck!


Mar 13, 2008 | Sony Grand WEGA KDP-57XBR2 57" Rear...

1 Answer

Thin red horizontal lines across screen

replace the focus block or try to adjust the screen control on the focus block for red only. this will affect the white balance of the set so adjust it carefully. the focus block is located on the front inside the set. remove the speaker cover then the 4 screws on the front plate. the focus block is 3" x 2" black box with 6 adjustment posts three for focus and three for screen. adjust only the affected screen (R).

Mar 13, 2008 | Sony Grand WEGA KDP-57XBR2 57" Rear...

2 Answers

Vertical color lines

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

Jan 15, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Strong red tint with horizontal lines across screen

if you have warrenty, return it. if not, then buya new one...the video fuses are dying...hard to fix it.

Oct 06, 2007 | Akai PT4799HD Rear Projection Television

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