An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 20 times.
An expert who has written 20 answers of more than 400 characters.
Re: nec picture turns megenta
I'm gonna take an educated guess and say this is a DLP projector. Sounds like the DLP wheel is slowing down causing blurriness and Magenta when the wheel stops. It probably needs a new color wheel. Call NEC and see if they have a bulletin or notice on this issue. If you're lucky, you might get a free new color wheel or replacement projector from them.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
the light filter on the blue lcd is fried due to excessive dust and heat. clean it out with canned air and replace the filter. unfortunately, you might have to replace the entire optical engine because benq doesn't sell individual parts for it.
I had the same problem. It is specks of dust on the DMD chip that the lens focuses on.
If you take it apart you can see a long telescopic lens that points at a small chip. This chip contains all the micro mirrors that produce the image.
Fortunately this sensitive item has a glass cover. Unfortunately it can be contaminated with dust. I just squirted a jet of air from a camera lens blower brush to remove the specks of dust. Problem solved.
Here is a link to a dismantling guide: http://www.flickr.com/photos/todbot/81868083/in/set-1749030/
(If you get any dark shadows at the edge of the screen then the light tunnel between bulb and colour wheel has partially collapsed.)
I had a similar issue with my EP739, the problem would start after about 3 or 4 minutes and then get gradually worse and worse.. The most strange thing I noticed was that white looked fine. And if you opened the configuration menu in the projector it appeared that blue was labeled green and green blue.. Some sites suggested cleaning the machine of dust, which I tried using a can of compressed air... This did not fix the problem at first.. but when I had it apart I studied the colour wheel for a little while and wondered if some how the machine was synching to it incorrectly somehow.. So I blew out the colour wheel location sensor (It's kind of obvious being the only component mechanically connected to the color wheel. Much to my delight, this fixed the problem...
So my solution to the flickering / colour fading / colour swapping issue with DLP projectors was to clean out the dust from the colour wheel location sensor..
In fact, if I did it again, I would ONLY clean the sensor, and leave the rest of the dust alone. Blowing dust around has the potential to cause other issues, especially if it winds up inside the optics system.
go to menu- go to setting -go to colour move slider to right hand direction befor you change the lamp -take care that some vga cabel(((cabel between pc and projector make this fault).then you have to change this cabel and try.
I can assist you with that if you want. It is very tedious, but can be done. You need a cross hatch pattern generator or something with vertical and horizontal lines to lineup the LCD Panels again. Tricky little procedure if your not familiar with it. Let me know if i can assist you and hopefully save you agravation at the same time. Thanks Jay
This is a solution for the VT 480 by NEC for filter clean. on the left side there are two slots that have dust filters which can slide vertically to reveal micro screens that one can blow, tap vigorously, or vacuum to remove any dust build up. I hope this helps you with your unit.
The ghosting problem is a combination of both the lcds and driver boards in which case neither need to be truely replaced.. They use a specific voltage to transmit data to the lcds.. Each lcd is different and the driver board is programmed by the factory for the EE v.com setting. Unfortunatly with nec, they do not offer a service mode to go in and adjust the ee settings to correct the electrical convergance. So the only way to fix the problem is to replace the lcd with a newer one who wasnt worn out from long term heat.