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Blue dot and shadowing problem with panasonic PTL500U

My panny PTL500U is 2 1/2 years old. Recently I noticed a shadowing problem after I changed channels or paused a movie. Also, a spattering of tiny blue dot clusters has begun to appear on my screen. The number of dots keeps growing. What is going on? and how can I fix it?

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SOURCE: Panasonic video projector, via Composite video in.

You may need to adjust your overscan.
To do this you will need to press "MENU", choose "POSITION", now adjust the "V-POSITION" and move it only until the white line disappears.
The line that you see at the top sounds like SMPTE code, which is used by broadcasters for many purposes.

Posted on Feb 28, 2011

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I changed the bulbs in my two projectors awhile back and a month or so later they both started getting a blue dot/haze that has progressively gotten worse...any ideas?

service is very important be four replacement of lamp if you have a Multi color background in your image then your projector just need service of LCDs and inner parts of projector.

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Seems the rgb is note centered getting 3 ghosts

This is a convergence problem that will require factory service. Convergence adjustments must be made with particular test images and tools to access the internal adjustments. This is not a DIY repair.


Feb 04, 2010 | Panasonic PTL500U Multimedia Projector

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My hitachi cpx 443 lcd projector recently has been projecting blue dots everywhere on the screen, how can I fix this or what is the problem?

How defined are the dots? Is each blue dot limited to the size of a pixel? I suggest you create a 3 slide image in powerpoint slide completely blue, 1 red and one green. then project each image in turn and note what happens with the blue dot. My first thoughts are you have some pixels that are locked. Once that happens if are pretty much stuck with them. Optical it is impossible for a dust on the lens etc to cause them as if the picture is in focus at the screen the dust is way out of the depth of the field, sometimes you can focus the projector so that the point of focus is the lens surface but then the actual content will be way out of focus...none of which has anything to do with your blue dots. Regards Kevin Andreassend, ICE AV Technology Ltd,

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1 Answer

Blue Haze on the left and various other places on screen

it's the polarizing filter on one of the lcds. they tend to fry due to excessive heat. clean the dust out of the projector so it can cool down properly. but you will need to replace that filter. it is fairly easy, but remember which plugs go where. however, many companies won't sell parts for or replace components of the optical engine or the prism assembly. if they don't, it's going to cost a bit. check the panasonic website for the closest authorized service center.

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1 Answer

How do I ADJ the convergence on my PTL555U projector?

These adjustments are internal to the machine, It is not a recommended user adjustment. Typically these are set at the factory under controlled conditions using a known signal source. Also, I'm not 100% sure about your model (I'll investigate further), but it may not be adjustable at all. How far out does the convergence appear to be? Can you see it under normal use conditions or only when using the test pattern?


Mar 06, 2009 | Panasonic PTL500U Multimedia Projector

1 Answer

I have a Panasonic LCD projector ( PT-AE700U) - I have had it for 4 years. Recently, I noticed it was projecting "blue" pixels on the bottom right hand side (small size maybe 3 x 8 inches) . Over the past...

your color calibration may be off. see if you can set the red green and blue settings all to "0" and see if that works. may want to refer to your manual and see how you can do that and also see if there is a auto calibration

Jan 23, 2009 | Panasonic PT-AE700U Multimedia Projector

1 Answer

Blue dots in the middle of the screen

The image processor must be getting old and worn out. Call Epson or go onto their website and see if it is  a dDIY project or if you will ned to send it in.

Apr 27, 2008 | Epson EMP S1 Multimedia Projector

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Pink/burgandy dots or shadow on display screen

Normally one of 2 things will cause this.
  1. One if the small LCD panels inside has dead/stuck pixels. There are 3 individual panels that make up red, green and blue.
  2. Dust has entere the system and is sitting on the back of the polariser. This is a thin colour film ontop of the small LCD panel that sends the right colour light through the LCD.
If it's the first one, then it will be covered under warranty.
If it is the second they will normally cover it under warranty since their dudst filters have failed to keep the dust out of the projector.

Call the number in the back of your user manual for your area and they will arrange it all with you from there.

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1 Answer

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Hi there

This could either be a bit of dust on the inside of the lens or the LCD's

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I just saw your post & today is Mar 19,2008. I had the same problem and was pissed until I noticed YAMAHA has a good warranty, so I sent it back and they put in NEW OPTICS that are non-organic (I guess the original ones were organic) NOW my picture is much better than when it was new. This picture is so clear I can not believe it.

May 19, 2007 | Yamaha LPX-510 Multimedia Projector

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