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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1 Answer

Screen is the color blue?


That isn't convergence that does that. There are "screen" trimmers, if someone has messed them up you can get all one color, but the usual cause is the picture tube going bad. The screen trimmers are on the PC board on the gun (narrow) end of the CRT. Some trimmers are color drive and others are color black level, or "screen". Don't adjust the color drives, it is a delicate balancing act to get them right. Find the one labelled blue and turn it down. If all you can get is too dark, turn the red and green up, just enough to see a dim color haze in a blank picture. Balance them out so the haze is gray. Then turn them all down just a hair so the screen is just black. Then try a picture. If you can't get gray on a blank screen then go to the high voltage transformer (the one that can kill you if you touch the wrong part) and adjust the "screen" control on its side up (it adjusts all the colors together). If you still can't get gray, one or more of the color guns is weak, and you may as well chuck it.
Of course it could also be a bad blue drive transistor, but fixing that takes more expertise than you can get from a forum.
Actually, just getting the TV open and propped up so it doesn't fall over is a job in itself...

Jan 04, 2014 | Samsung PCL5415R TV

1 Answer

Blue haze and blue lines. no true black color


Projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both. Repair kits with instructions are also avail from www.TvRepairKits.com

Common Problem #1) Convergence has gone out

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


7859b01.jpg

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69189a5.pngSOLUTION #1

For more more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Mar 05, 2011 | Sony KP-57WS500 57" Rear Projection...

3 Answers

Our 1991 RCA projection TV P52150CP started being hazy blue when first turned on then it gradually would become mostly normal screen. Today the whole screen is a blue haze. You can see the picture sort of...


Most likely it is the Blue CRT Driver Board or the Blue CRT failing. There is no quick way to varify unless you call a repairman out to see.
Hope this Helps,
Skyassoc

Jul 03, 2009 | RCA P52926 52" Rear Projection Television

1 Answer

Blue haze on the lower part of rear Projection TV


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
701cb04.jpg
77ea520.jpg
f0900cb.jpg
Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

578ba6c.jpg
TV set after fluid change

65af323.jpg

2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Mar 23, 2009 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Screen hazzy and issue with blue convergence


bad convergence would cause show to look as if it was supposed to be a 3-d movie, if a bulb was going out then people would look purple blue -green,or some other off color, so likely the green bulb is going out from the color of the people you described.

Feb 06, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Blue Haze comes out the left side of screen top to bottom about 3 or 4 inches.


What needs to happen is three specific voltages need to be adjusted on the power supply, You need to set the Ve voltage to 100v, the Vset voltage to 188V and the Vs voltage to 190v. Monitor the set for 24 hours, if haze doesn't come back the unit is considered repaired. If haze returns, then the problem is with the panel itself and wouldn't be worth it to replace because it will cost more than the tv cost you originally

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1 Answer

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The blue filter is burnt out. A very common problem in Zenith DLPs. There are 3 color filters, 1 blue (a pinkish color), 1 green (a grayish brown) and 1 red (it is red) they give you your colors for you picture. This is a simple fix.

Mar 19, 2008 | Zenith E44W46LCD 44" Rear Projection...

1 Answer

Zenith D60WLCD with blue haze over entire picture


throw the set away!the part required to repair the set is the optical engine.Zenith made alot of these sets with defective engine assemblies in wich the lcd filters burn,which cannot be replaced.The labor is also silly.Theunitrequires a complete teardown for replacment.You could buy a very nice new set for the repair bill

Feb 20, 2007 | Zenith D60WLCD 60" Rear Projection...

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