Question about Panasonic PT-AE700U Multimedia Projector

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Yellow middle, Blue Exterior

The middle of the screen in a roughly oval shape is yellow tinged - appears to be an absents of blue while around it is blue tinged.

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  • Anonymous Dec 10, 2008

    I had the blue haze growing across the screen forever, then one day this happened (the yellow middle oval with blue haze still on the outsides). After removing the blue panel, the burn is obvious. Some on the avs forum have said that just the blue can be replace, others say the whole optical block...which is it? And where can I get the parts?

  • Rumorhazit Dec 13, 2008

    Does anyone know the approximate cost of the Blue LCD Polarizer? I have the exact same problem and am wondering if I should seek repair to unit or sink it.

    Thanks for any help.

  • Anonymous Feb 01, 2009

    I have the same problem with only 4000 hrs. I will not buy another panasonic again.I am finished with projecters...junk!!!!!

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  • 563 Answers

Hi Druaga

This is a Blue LCD Polarizer that will have to be replaced if the spot shows yellow.

You will find that this will only get worse as time goes by.

Posted on May 28, 2008

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I have a VT465 and the projection back ground is yellow and I can't get it to be white


If you are talking about the actual image that is coming from a laptop being yellow instead of white, then this is caused usually by a bad signal cable running between the computer and the projector.
To be more specific: All colours in a projector get made up in some way between red, green and blue. White is all of these colours at maximum, yellow is made by red and green at maximum but no blue. If your image is Yellow when it should be white, then the blue signal information is not reaching the projector. This can also happen within the projector or computer itself but is less likely. If your using a VGA cable (15 pin cable) then blue is run through pins 3 & 7 (positive and negative respectively), see if your cable is either missing these pins on either end or if they are bent, although it's more than likely within the cable itself. You can test this theory easily by trying to put something blue on screen, if the blue signal isn't getting through then it'll appear black.
If changing the cable doesn't solve the problem try testing the computer by trying to use a different one, and test the projector by plugging in a monitor or another projector.

If you are getting a yellow screen without sending signal and just trying to get the "no signal" or "no input" screen white, then this won't be the case.

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I,ve got a red spot in the screen i replaced the bulp but stil have the problem


it is most likely a burned polarizing filter. There is a polarizing filter on the blue light channel and another on the red channel. When black, or other dark colours are displayed, the red polarizing filter is supposed to block ALL of the red light being projecter. If the filter is burned, some light slips through and creates a red tinge on the projected image. If the red tinge only appears on dark images, but is absent when the images is completely white, a damaged filter is likely the problem.

Seems its hard to buy them. Best bet is probably buying a broken projector from ebay and stealing the filters out of it.

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here are some probable causes..
This appears to be an older model (over 5 years old) and LCD projectors turn yellow with age. It's just what they do
However, if you are projecting a computer signal or a component signal, a short in the blue signal of the cable can cast yellow hues over your image. The hue will cover the entire image as if you are viewing the image "through rose (or in this case, lemon) colored glasses" so to speak. That's an easy fix.

Harder fixes: the blue LCD panel is weaking and/or gone bad.

If you have a round yellowish spot in the middle of your screen, the diffuser has been overheated and is "burnt".

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From what you have described it sounds like a damaged internal lcd panel, can you post a photo anywhere and I can confirm?

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Sharp notevision xgnv6xu oval yellow spot


I have a similar issue with yellow pattern on the left and top right of my screen. Took it apart and found the blue lcd had damage that matched the yellow area that was projected. I thought it was the lens but it was the blue lcd .It has gone bad and no replacement. Are you interested in selling the bulb or the whole projector? I have since purchased another projector and am keeping the bad one for spare parts. Hope this helps..Ben
bgrenco@aol.com..

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1 Answer

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It is possible that the lenses are dirty.(Someone might have touched the lenses with wet hand)
Also check if the illuminating bulb is working fine. Like how old is it and does it need a replacement.
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Hi Zenmast

This is a burnt LCD that will need replacement. If the circle is yellow on a white screen , then it is your blue LCD that will need replacement.

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Your problem is most likely your Blue and Green lens' inside the light engine. It's not something you can replace yourself. I worked for Philips for 14 yrs. repairing the LCD projectors the last 6 Yrs. Call philips and get the number of an ASC in your area that has repaired projectors.

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