Question about Samsung HLN467W 46" Rear Projection HDTV

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Picture Issue - white discoloring artifacts

I've owned my DLP for a few years and just started noticing a line of white discoloration on the screen. It is very faint when you're watching TV but noticeable if a scene has a solid color in it. The discoloring is about 7in long and 2in wide - it almost looks like a shooting star. It is very noticeable when I turn off my set and the screen goes black before it shuts down. Is this a bulb issue? Any help would be appreciated.

Posted by ekeough on

  • Anonymous Mar 12, 2014

    samsung hls4266wx xaa --"off colored" pixels--best I can describe it--lines of them across the entire screen and both sides have strange discolored 'blobs' of the same discoloration. just replaced lamp with expensive Philips lamp, was very careful and the screen is the same. is this a color wheel issue or something else? how do I fix it--or should I take it somewhere and have it looked at? Thank

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Cary Farah

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Sounds like light engine to me

Posted on Feb 06, 2008

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1 Answer

What is causing white vspots on my tv?


As you probably know, your DLP (Digital Light Processing) TV works by projecting Red, Blue and Green light from three LEDs or a color wheel depending on your model, onto the DLP chip which contains rows of thousands of tiny mirrors. These mirrors reflect the colored light through some lenses and other fixed mirrors and onto the back side of the big frosted plastic screen on the front of your TV cabinet. In the neutral position, these little mirrors don't reflect any light onto the back of the screen. If they flex into a certain position they will reflect any light from the three LEDS shining on them. What color depends on which LEDS are on at that moment. Each one of the mirrors is roughly equivalent to a pixel.


Any mechanical thing will eventually fail and if any of these mirrors fails in the OFF position, then no light will be projected to that mirror's target on the big screen. You are not likely to notice one "pixel" on your screen being dark though. However, if any of the mirrors fail stuck in the in the ON position they will continuously reflect all three LEDs light to that mirror's target on the big screen. This little white dot is noticeable and your attention will constantly be drawn to that stuck mirror's white spot. Once one mirror fails it is only a short time before more and more mirrors stick in the ON position and you see dozens then hundreds of white specs. It's VERY annoying.


Fortunately, if you are fairly DYI handy, it's not a big job to install a new DLP chip (or LEDs for that matter) into your DLP rear projection TV. Do a BING search on the internet for the make/model of your TV and something like "how to change the DLP chip" in that make and model. There are plenty of YouTube videos on line that make the procedure very clear. If after watching the video you don't understand the procedure, that's an indication that you shouldn't attempt it. I've replaced two LEDs and the DLP chip on my Samsung 65" TV. That might seem like a bad thing but if you consider that the TV was 7 years old at the time and these seem to be the only parts that fail, it was worth it to more or less make the TV like new again. When you search for the parts, watch out for sellers with low part price but ridiculously high shipping cost. I found that Sears.com had the best price and shipping times for these parts.

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Hi if your tv is a dlp it might be an issue with the DMD board Hi,Yes your problem sounds like the DMD board.This is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens. Here's a video that will help you find where the DMd chip is located : http://www.youtube.com/watch?v=0jr_9A5Xd2Q Have a blessed one!

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1 Answer

Discolored Sides


Hi,Yes your problem sounds like the DMD board.This is how it works: http://electronics.howstuffworks.com/dlp1.htm Basically the light of the lamp goes through a tunnel that carries a color wheel(rotating disc with a gamma of colors that creates the colors on your tv)then the light of the lamp goes through the DMD board which is a chip composed of around 2 million pixels that creates the images and colors.When it starts to fail it will create black bars,pixelation,color distortion or white dots on screens.Ths if your tv is a dlp if its a Lcd it will be an issue with your light engine: Here's how your tv works: http://www.youtube.com/watch?v=ZLLHnQ4y-wo Basically there's 3 LCD chips that create the colors and image by blending together.When these chips start to melt you will get those blue spots, pixilation even vertical lines.You will need to replace the light engine. Have a blessed one!

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1 Answer

My 32 inch samsung lcd tv has got faint black lines running down the screen ,its nearly 4 years old but i expected it to last longer than that,and ive had sky hd box recently would that have anything todo...


Are these lines on both side of the screen or what location are they in? They can be caused by watching 4:3 television with the black bars on both sides. Watching 16:9 full screen HD wont cause issues with that. If only on the sides there is not much you can do except put a pure white screen on the TV and leave that on for at least 6 hours. This will age the panel a little but in theroy wil even the pixel burn you have to make the lines less noticable. Please take a few moments to rate my answer. Thank you

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The random whit dots you are seeing is more than not the DMD or million little mirrors board. The white spots represent some of the mirrors that are sticking in the on position. In that case they are always reflecting white light from the lamp. I don't concider the DMD board a do it yourself repair since on the older DLP set it requires mechanical alignment as well. The best thing to do is contact a techincian and see what they might charge to repair the TV for you. Please take a few moments to rate my answer...Thanks..

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1 Answer

Vertical white line down centre of Soniq PT42SH plasma TV.


One of your "X" buffer boards is defective. In Panasonic plasma tv's they are located at the bootom of the set and connect directly to the plasma diplay panel via a thin ribbon cable. The board you want to replace will be directly in line with the discolored vertival line in the picture. The part number is on the circuit board and usualy starts with "tnp..." or "txp..."

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If you bought the set new you might just want to contact the manufacturer - if they are decent, they might just try to help you out with your dilemma.

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Changing the lamp on a DLP LCD tv


Most definitely! The lamp is a consumer replaceable item and your owners manual should have instructions on how to complete this task. If you don't have your owners manual and more post your model number and i will get you some instructions on how to replace it!

Tim Nolan

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I would suggest to try to get this TV fix while still under warranty. Normally the manufacturers give one year.
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replace the pcb convergence board,, It costs $96 and takes 10 minutes to replace you will have to manually line up your convergence afterward as the settings go to factory default. Everyone that owns this set has or will have to replace this part within 3 years
http://www.samsungparts.com/search/search.asp
Or Vance baldwin online
Part number bp94-00155a

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