Question about Hitachi CP-X445 Multimedia Projector

3 Answers

Seeing a blue "haze" on presentations, and when on blank screen

I've changed the bulb and air filter. We';ve adjusted the color settings, etc. There is always a blue haze over the presentation, even if you hit the blank command button in stead of going black, the screen goes to this dusky blue color. The blue haze is always there, unless the projector is off. I've changed the bulb, and air filter with factory parts, and have had no success. ANy advice?

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  • caseyp Feb 27, 2009

    The projector is used for a variety of purposes, but the source is always a computer. We have the projector connected to a docking station, and will place a laptop on that connection medium to play dvd, show web videos, or go through PPT presentations. What do you mean by going through the RGB factory settings?

  • Sachin
    Sachin May 11, 2010

    In most projectors, some additional setting (especially for resetting and recalibrating) are available for the service engineer to monitor and these settings are called factory/service settings. These setting can be set by toggling of few switch in a certain sequence or thru a special remote available with the engineer. It depends on your model of your projector the method of opening the factory settings.



    By RGB, I mean the red, blue, green setting available on your projector. (you can increase or decrease the gain of these colors).

    If you change these setting and remove the blue cast, then fine. Alternatively, you will need to ask for service advise.



    Try connecting a DVD player and see if the blue cast is there. This will ensure whether you can set it yourself or need the projector to be taken for service.

  • Sachin
    Sachin May 11, 2010

    Is the signal input to your projector from a computer or a DVD player or both ?

    Are both having the blue haze. If yes, then the projector need to be set thru the factory reset menus. ( need service advise) alternatively, if it is only on the display from the computer, then you can check the RGB settings on your projectors.

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That is the fault of the blue LCD being damaged by higher energy in the blue light. The manufactures are aware of this too. Google it if you want, it is a known failure. Lots of the 3LCD get this after about 2000 hours, so why do they make the bulbs replaceable in these? Unfortunately the only repair is replacing the whole image engine, unless you wanna try this: I took two Identical projectors with the blue hue and used the green LCD panel from another projector to replace the bad blue one. Alignment is real tricky, I used to be a TV repairman and did color convergence so this is similar. It returned to a beautiful picture but was a bit of work, although cheaper that buying the image engine!

Posted on Jul 22, 2015

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The blue or yellow haze problem in this projector is because of two factors. 1) Dust buildup inside the optics and 2) Fading colour filters used in the internal optical process.

Inside the projector the white light from the lamp is split into three distinct colours of red, green and blue. Each colour illuminates their own monochrome LCD. Those LCDs are mounted on a prism that combines the separate images and displays the result you see via the lens.

The optical process to split the light up inside the projector is fairly complex and involves many light filters and mirrors to direct the light to the appropriate lcds. Those filters and lenses accumulate dust and also fade over time due to heat and other environmental factors.

I know that sharp sells replacement filters at $100 a piece. I do not know if Hitachi sells replacements.

To remove the dust and change filters you have to take apart the projector in a fairly complex way. I do not suggest that the average user do this. Good luck!

Posted on Dec 06, 2011

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On the "Option" menu, try selecting "Service" and the "Factory Reset". This may help. If not, you will have to use the menus to manually adjust the level of blue in the projectin. Go here for the manual for your Hitachi and you will find instructions:
http://www.aboutprojectors.com/pdf/hitachi-cp-x445-manual.pdf

Posted on Aug 01, 2009

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