Recently came to our laboratory a projector Optoma’s and specifically the hd800xlv with a mystery color problem.
They say that a picture is equal to a thousand words …. and rather thus is. ..
See the well …
Mystery problem in principle xenise us because he had not appeared, although constant recurrence in the tabs of the gray scale, sparse and whenever he wanted during the film.
Not lived anything other than urgent surgery.
After aposteirwsame our tools and our bench, we started …
If you enlarge the photo you will see that the color wheel was pretty dirty …
After we left the projector “chassis” … the series had the Visual to see what happens in the …
Enough dust and soot … as expected …
The incremental iris of Optoma precedes the lens …
Let’s look at the operation of the position of the DMD chip.
Open …
Closed..
Here the toynelaki crystals that leads the light from the color wheel directly into the Visual.
After a good cleaning in the projector’s optics we are looking for the solution of the problem …
In DLP projector, responsible for the colors is the color wheel. From the beginning had passed through our minds that something strange was going on and the wheel does not turn properly. When the tsekarame and found that it works perfectly, there remained nothing else from the sensor (color wheels have a motion sensor in order to inform the mainboard for the speed of the wheel and this act accordingly).
The sensor was slightly moved from the correct position with the result that reads the wrong speed. This means that sent wrong information to the mainboard and this in turn sent wrong information to the chip and the color wheel.
The result was the chromatic paradoxes that we saw in the first pictures …
Also note that the sensor needs and careful cleaning (even few dust grains onto the create again the same or even worse impairment).
This is the sensor and wants much attention on putting the slightest deviation leads to color problem.
After we finished the repair order had the test ….
Even after we had in our hands and chanced the owner is white screen holder with 1 gain (same features as ours) we grabbed the opportunity to throw a kalimprarismataki.
Clearly and display space has huge significance in other calibration if the projector is completely arrythmistos, can only become better if individually to display the same characteristics and it did.
So we measured the projector with the settings you had …
And this was after our own carving …
Note, we did not have complete blackout in the area and under the 30IRE had trouble to measure (it seems clear on the charts). Also color could not do much in the absence of CMS.
The projector turned out kalimprarismenos close to 650 lumen brightness (important detail that wore lamp Chinese origin and had been in the back of already 250 + hours).
To measure the difference before and after cleaning, we got to a specific distance from the lens (somewhere in the 30 points) measurement with the loyxometro.
Before cleaning 1037 measured lux at 100 IRE and after cleaning 1273 lux. We had an increase in brightness of over 20%, not bad by even not changed bulb.
Also big difference we had and in ansi contrast, not entered in to the measure, others with the dropped the first scenes from famous movies we saw that picture the projector had gained back this sharp and three-dimensional texture of DLP projectors, which had no texture when we saw him for the first time before cleaning.
The greyscale (RGB) showed wonderful even to the eye as you see in the pictures below …
and some still photos with the projector in action …
The projector is already in the hands of its owner and as we were advised in a telephone contact that we had with him a little while ago, did not believe his eyes when the change in the area, “another projector” were his words precisely.
We from our side to wish him “good hits”!