Question about Samsung HL-R5678W 56" Television

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Replacing light tunnel (instructions)

I am getting a shadow about 2 in wide running down the left side of my tv. i was told my a samsung tech that i don't need to replace the entire light engine, but just a small, sheaper part called the light tunnel. any service repair centers around me have no idea what i'm talking about. i'm looking for some instructions on how to do it myself.

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Re: 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

Posted on Jul 25, 2007

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Re: replacing light tunnel (instructions)

Old post i know but may help someone out
I have solved my problem of a dark shadow on the left hand side of my
samsung DLP sp4sl6hv using this video which was near enough the same as my set. When i could see the light tunnel i used a toothpic to push the mirror on the right back in place (it was a fraction of a millimetre btw) and all is well now. I also used this video for removing the whole light chamber as there are some wires to remove before removal, hope this helps in some way, costless fix to

Posted on Nov 13, 2012

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Re: replacing light tunnel (instructions)

Alin can you post instructions. The video Andy mentions is marked private and I am experiencing the issue too.

Thank you in advance,

Posted on Jul 27, 2015

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Re: replacing light tunnel (instructions)

Never replaced a Light Tunnel Myself, I have heard of this problem, Toshibas have done this to me as well, it is MUCH easier to replace Light engine and results in better repair, once you start taking a microdisplay engine apart you run the risk of contamination.

Posted on Jul 11, 2007

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Shadow appeared on my DLP TV after replacing the lamp

this is a light tunnel failure this component will have to be replaced and is a part of the light engine

Feb 14, 2010 | Samsung HLR5667W 56" Rear Projection HDTV


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

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

The left side of the tv has a shadow on it

You have a bad Light Tunnel and needs to be replaced by a trained service tech. I bet you have a Samsung. If it is a Samsung there is a recall and a tech bulliten on this problem. Samsung might pay for the repair. If they resist ask for the ECR group and mention the Light Tunnel issue. This is not a part you cannot replace yourself.

Jul 12, 2009 | Projection Televisions

1 Answer

I have a dark shadow down one side of the screen

replace light tunnel = use service manual for procedure....T.

Dec 13, 2008 | Samsung HLP6163W 61" Rear Projection...

1 Answer

Two inch shadow on tv

Change the input to AV1 or AV2 with no signal and see if it's still there, if it is you might have a defective light engine in which a lot of manufacturers will warranty. This can be repaired in the home but some shops preferr to take them in, try for the in home co's first. Just a word to the wise, DLP's do not last as long as you may want.

Mar 19, 2008 | Projection Televisions

1 Answer

56 inch Samsung TV

This shadow is called by the light tunnel in your optical engine. You can have someone come out and try to fix the light engine. I am an authorized samsung tech and about 80 percent of the time I can rebuild the light tunnel. If the tech can not fix the light tunnel you would have to have the optical engine replaced. The light tunnel is something you would not want to attempt yourself. At least you can explain to a shop what your problem is..if they have not heard of this call a diffrent shop.

Feb 08, 2008 | Samsung HL-R6167W 61" HDTV

1 Answer


Search for "Light Tunnel".

Feb 05, 2008 | Samsung HL-R5078W 50" HDTV

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

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