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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  • debbi brant Jun 13, 2007

    Yes, I would greatly appreciate the instructions for removing the front panel. Once off is the adjustment complicated itself?Thanks for replying D.Ruth

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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: http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html

Posted on Jul 02, 2007

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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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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)
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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

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3ee50f1.jpg
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1 Answer

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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.

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