Question about Philips ProScreen 4750 Impact Multimedia Projector

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Color bars on both sides of picture

I actually have a Phillips Fellini 100. The problem started small on the right side of the picture, with a couple of small color bars visible in the picture. Now, this has progressed from both sides to virtually the entire screen. No idea where to begin to try to fix, or even if its worth fixing. Any ideas what the problem might be?

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Re: Color bars on both sides of picture

I've got a similar issue with one here. Problem appears to be a defective LCD,in the blue position, as swapping it with the one for green (the middle one) resulted in green bars instead of blue ones.

The good news: the LCD panel is easy to remove.
The bad news: the LCD panel is a NIGHTMARE to re-align when you refit it. I now can't get the green panel to line up properly, and of course the blue one's still faulty!

Posted on Aug 27, 2010

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Re: Color bars on both sides of picture - Philips ProScreen 4750 Impact Multimedia Projector Multimedia Projectors

The Problem seems to be in the RGB Panels.

Posted on Jun 04, 2007

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I have a small discoloration in the upper right hand side of the screen coming from this projector. It has been the same for 6 months and you can only see it when the picture is lighter in color. I have...

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It sounds like you have mounted the replacement light tunnel incorrectly. It is a common error. What has happened is you have the light tunnel sitting on yop of the positioning stop which is opposite from the color wheel side. If you take it back apart you will see that it's not laying parallel to the casting. if you reposition it so it is just touching where the opening is in the clamp on the color wheel side you will feel it fall into place.

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The fan replacement control chip actually cost's $1.55
That's one dollar and fifty cents! and is ridiculously easy to replace! I've done approximately 100 of them.
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Installed new color wheel not working correctly

Hi danny,

I also replaced the color wheel in my EP739 after the old one disintegrated suddenly. Colours were then all over the place. Actually, it looked like each colour channel was displaying all the colours of the rainbow!

Here is the procedure I used to solve the problem - maybe not as elegant as Marrie's solution, but it will not cause any damage, will most likely solve the problem, and you will be able to get everything back to the way it was if it doesn't work:
  1. Have the projector running and displaying a stationary picture. The right sort of picture to use is one that has a full range of brightness values from near-black to peak white. I used my lap-top as the source. Also, this way you can compare the projector's picture with the picture on the lap-top.
  2. Press the power button once. "Power off the lamp" dialogue box appears. Hold down the left arrow button until the service menu appears (takes about 8 seconds).
  3. Using the up/down arrow buttons, scroll down to "Color Setting" and press "enter".
  4. Scroll up to "Color Wheel Index". Make a note of the existing setting for later reference. You can change the Index setting over a range of 100 to 550 by holding down the left/right arrow buttons. As the setting changes, the colour rendition will slowly change, and at some point the colours will come right. Note that the changes are quite slow. Find the lower and higher settings where colour aberrations just start to appear, and set the Index mid-way between.
  5. If this doesn't fix the problem, return the Index setting to original. My original setting was 354 and the new setting was 461.
I do not advise touching any other settings in the service menu unless you have access to a service manual and know what you are doing.

Good luck!
Father Dave

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Dude! You just saved me 250.00..It worked...I could kiss you!! ...HA! HA!...:)

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I also am having the same problem. at first it only showed up after the projector was on for about 15 minutes. Now I get a purple vertical bar on the right of the screen. I also get vertical green bars spread across the screen.
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1/2 the screen is viewable

You would be wrong. Lamps do not do that. They either work or they don't, they do not cast shadows or give half an image.

What is going on is the light tunnel has failed. It is a small, 4-sided mirrored tunnel that focuses the light into the optical chamber. It is directly behind the color wheel. I've seen this probelm dozens of times.

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