Question about Samsung DLP HL-P5663W 56" TV

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Samsung HLR5668WX Light Engine

My Samsung DLP TV has developed a shadow down the right side of the set. I've been told this is a bad light tunnel. My repair shop only replaces the complete Light Engine for about $1,000. TV is 9 months out of Warranty and Samsung would not help.

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  • labellaappra Jul 22, 2008

    I have a 42" Samsung DLP about 2 years old. I am getting a 2" shadow down the left side of the screen. I have heard it is the light tunnel, are these expensive and possible to replace by a laymen?

  • Anonymous Nov 13, 2008

    I have a 50"dlp samsung with a shadow n the left side.
    Where is the light tunnel?

  • Anonymous Nov 14, 2008

    3-4" shadow on left side of screen.. Appears to be a light tunnel obstruction type issue... Out of warranty so would like instructions on how to fix this simple looking issue... Image can be seen in the

  • Anonymous Dec 24, 2008

    61 inch HL-R6167W Never will buy samsung again



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To start off, this is a very complicated procedure. I did this myself, and the actual repair of the light engine took about an hour, and the calibration afterwards took about 20. Make sure its worth the time investment to do yourself instead of having a pro do it.

To get to the light engine you basically need to rip apart the guts of your TV. If you open up the back and pull out the "insides", from here, you need to remove the color wheel, the small heat sync fan and the metal plate it is attached to. Remove everything until you get to a small metal tube that kind of looks like a sight on a rifle if that makes any sense....There are two very small screws on the top and right side.

BE WARNED!!! these are horizontal and vertical adjustment screws, so count the number of turns you make to get the settings back to where they were after this step.

Loosen the two screws enough to remove an even smaller metal tube inside. There are 4 mirrors inside (BE CAREFUL when handling them) and odds are one or more of them came loose. I used some glue on a Q-tip stick, or a toothpick works too, and secure the loose mirrors in place.

Once the mirrors are secured, put everything back together again, and fire up the set.

The best way to make further adjustments, if they are needed, is to have someone look at the screen while you adjust the horizontal/vertical screws I talked about earlier. A second option is to go into the TV's factory setting menu and use that, but that is really for minor adjustments, so use carefully.

Hope this helps, and let me know if you have any questions.

Posted on Feb 04, 2009

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This is a problem with SAMSUNG DLP's However it is one of the greatest electronic companies as far as consumer relations. Call 1-800-SAMSUNG the light tunnel issue is one that the will fix outside of the warranty... the will set up a service appointment and everything. good luck!

Posted on Nov 15, 2008

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It is not the light engine, it is the light tunnel. The tunnel is four small pieced of crappy glass in a aluminum tube the size of tootsie roll. I took mine apart today and one of the mirrors simply moved out of place. Need more help email me at

Posted on Sep 19, 2007

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You can purchase a light engine from for a reasonable price. I've been buying them for our service center and they are working out great. The problem is that you need to make sure they have them in stock..

Posted on Jun 01, 2011

You can replace just the light for much less money. Check out the posts here.

Posted on Aug 29, 2007

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1 Answer

Samsung HLS6187WX / XAA I have a 2" vertical

About $600.00 to replace. That's why manufacturers stopped making DLP sets because longevity is horrible. 5 yrs MAX if your lucky.

Nov 25, 2010 | Samsung Televison & Video


Rear projection TV displays a shadow on one corner or side of the screen.


This tip may be helpful only if your rear projection TV is displaying a darker shadow on one portion of the screen. If the shadow shape and size will not vary, that means that there is probably a detached mirror in the device called Light Tunnel, located inside your TV.

Most rear projection TV works projecting the light from the internal lamp on the screen. Before reaching the screen , the light will pass through a 'pipe' whose internal surface is covered in rectangular mirrors, located all over the tunnel surface.

A quite common fault is caused by one of the mirror detaching from the the light tunnel internal surface , and falling down or hanging in there. This will be seen on the display as a darker shade located near to one side of the screen.

The light tunnel is located in the light engine. To repair the problem the TV must be disassembled by a technician. Accessing and disassembling the light engine is not a repair that can be done by the owner.

Click here to view pictures of a light engine for a Samsung rear projection model. The tunnel is the optical device located in the light engine.

If you are a technician, to replace the light tunnel you will have to take apart the light engine, that apart of being quite a sensitive optical device, is also the most expensive part on a rear projection TV.

In that case you may find useful the service bulletin posted below, that is illustrating how to replace the light tunnel on a light engine for Samsung rear projection TV. Please be aware, that if you attempt doing this operation without sufficient knowledge and experience, you may damage your TV set beyond repair, as the light engine is very expensive.

How to replace light tunnel on a Samsung rear projection:SERVICE BULLETIN

The file is on PDF format.



on Feb 05, 2010 | Samsung HL-P5063W 50" Rear Projection HDTV

1 Answer

There is a line, like a shadow on the right side of the screen all the way up and down. What is that from?

Your TV uses a "Light Tunnel". A part which has various filters to create the proper "color" of light needed to produce the picture. Sometimes, one of these filters slips, causing a shadow to appear in a corner or along an edge. The appearance is this defect is more of a shadow and does not have a sharp, defined edge (like a letterbox image would). You can replace the entire light engine to repair this or just replace the light tunnel. The light tunnel repair is much more difficult... I would recommend a service call, as this is not a simple procedure. I hope this helps.

Mar 17, 2010 | Samsung 61" Slim-Depth DLP HDTV

1 Answer

My dlp tv has a shadow about 6'' wide and full ht of tv

Hello: The problem is that a small mirror on the light tunnel has fell off causing a shadow in the picture,. In the past the only way to repair this problem was to replace the entire Optics Engine. But Samsung decided it was replacing entirely to many light engines so they decided to allow and train technicians on how to do it. It involves removing the color wheel and behind it is the light tunnel where light from the lamp shines on to a maybe 1 1/4 inch small block with three mirrors on all sides, your problem is that one of these mirrors has come loose from its side, causing a shadow with the pic still in the background. So if you call a technician to come, if he has'nt had the training from samsung on how to do the procedure then he will want to replace the entire optics engine which is the expensive way of doing it.
So when calling as if they know how to replace light tunnel. There are some adjustments that also needs to be done once it's replaced. To verify what i am saying go to this site to find out more.

Call if you need more info will be glad to help..
Phone: 702-418-1389

Sep 26, 2009 | Samsung DLP HL-P4663W 46" Rear Projection...

1 Answer

Samsung 2006 56" HLR5688W DLP TV Right half of screen turns black. Left side normal picture. Corrects itself when set is turned off and back on. Randomly occurs - sometime picture is ok for half a day...

Possibly a bad light tunnel assembly if the part is only a shadow effect. If not then probably a bad DMD board. The DMD board is part of the light engine but needs to be replaced by a technician.

Aug 15, 2009 | Samsung Televison & Video

1 Answer

Three inch shadow running down on right side of screen

Light Tunnel needs replacement.

Web page describes:

If you are in Calgary, Alberta, email me.

If not, look at the repair person finder at Homepage of the Fixya site.

This is only for the Samsung DLP, comment is not indended for the other makes listed below the problem.


Jun 27, 2008 | Televison & Video

2 Answers

Shadowing on right side of TV

Replacing the "light engine" fixed the problem. The technician said that there was a felt-like lining in the light engine to prevent undesirable reflections from the insides of the light-engine hardware, and that it becomes detached and blocks an edge of the picture.

We had a dark line along the right-hand side that was like looking at that portion of the picture through a 1" strip of very dark glass.

Because the DLP is new technology, we purchased an extended warranty from Best Buy (actually, their Magnolia subsidiary) which covered it.

The new light engine was slightly different physically, and the technician had a hard time getting the picture centered and aligned on the screen after installing the new one. In fact, he gave up on the first one and fetched a second one from his truck. He also had problems with the second one, but finally got everything aligned.

Feb 22, 2008 | Samsung DLP HL-P5663W 56" TV

3 Answers

Left side of television just started having a shadowing problem?

I have the same problem and was told by a technician that I need to replace the light engine. Probably around $ 700.00.

Oct 15, 2007 | Samsung HL-R6167W 61" HDTV

4 Answers

Replacing light tunnel (instructions)

Hi, if you did not get help until now, i can send you step by step instructions and photos how to do it. I did several of these and it is not a big deal.But you will have to take apart a very sensitive optical device and if you are not confident that you can do it do not start this.bp67-00291a is the part number for the light a message here if you need that file with instructions

Jul 09, 2007 | Samsung HL-R5678W 56" Television

1 Answer

Replaceing light tunnel

renotify the samsung teck for more information and assistance

Oct 18, 2017 | Samsung HL-R5678W 56" Television

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