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27 February 2018
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Cleaning spots in BenQ W series

Many DLP projector owners (and not only) often densely ask me how to clean their projector to remove spots that appear on the screen usually more strongly on a black background.

So I decided to do this here article-guide explaining what exactly is going on with these stains and what exactly is the way we clean them, if it naturally catches our hand.

The guide is for W1110, W2000, w1090, w1210st and generally all BenQ W series headlamps with close chassis.

What exactly are these “spastic” spots that appear unannounced on our screen?

These stains are nothing other than dust particles that sit on the surface of the DMD chip inside the DLP optical machine. A single such speck is capable of giving us a spot of 5-6 cm of green hue in a projection dimension of 100 inches.

How does dust penetrate the inside of the optical machine?

Unfortunately, all the new DLP lights in the ~ 1000 Euro category do not have a sealed optical machine. The result is over time to penetrate dust and to the DMD chip, with the known results. The ingress of dust into the optical machine is accelerated if we make the mistake and “blow” our headlight so that we can clean it under maintenance, as many owners do, especially at the point where the projector lamp is.

How can I clean these stains and see a picture without them? 

Unfortunately the way is only one and it concerns fully loosening of our projector and internal cleaning of the optical machine as described in detail by the following lines of the article.

Let’s go see how the stains are done on a w1210st.

(Be sure to disconnect the power cord and take all necessary precautions to remove the lamp before doing anything!)

Start by solving the two screws that hold the lamp cap

Open the lid and remove the lamp

After unscrewing the 5-6 screws at the bottom we can lift the top housing of the projector

And so it appears before us the inside of our projector…

We continue the loosening…

Then remove the metal protection of the mainboard

And then mainboard after we unplug everything from her. Beware of disconnecting the kalwdiotainias of the color wheel!

Then we must remove the metal “chassis” on which the mainboard sits.

After we get to the point of seeing the projector’s power supply (which includes the lamp power supply, within the economy and the cuts of cheap models)….

… We are ready to remove the optical machine as well.

The optic sits on these three bases..

Now let’s get to the bottom of this case. There’s a secret here. We’re not trying to unscrew the chip like it would make sense. Instead we go from the opposite side and unscrew the lens, believe me, this is the best and most harmless way to clean it..

And this looks like the dust on the surface of the DMD chip…

Clean with air pressure (preferably using a jackhammer rather than spray), check if our optics are spotless and rescrew the lens carefully.

Since we arrived here of course it is advisable to clean the color wheel, two screws and it is revealed, we do not need to remove it completely above the optical

After cleaning carefully (very carefully!!) and the color wheel we begin by following the steps above to xanasynarmologoyme our projector with patience, patience and patience. Any hasty movement in such situations leads to destruction usually…. Empirically I assure you..

Finally, we place our projector opposite the screen and enjoy our movies again without a trace of these annoying spots! (and with an improved image I would say that the dust on the DMD and the wheel also influences the image while reducing the contrast!)

I hope some of you found this article useful!

Good views,

Nikos Tsοlas

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