Question about Sanyo PLC-XP45 LCD Projector

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The projected picture has a light yellow coloring in the center of the screen?

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  • 442 Answers

The blue polarizer is most likely burnt due to much use

Posted on May 22, 2011

  • kdp101 Jun 07, 2011

    Where can you get new polarizers or LCD panels for Epson powerlite emp-7900P

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My tv screen when on turns yellow then after a while it will switch back to normal colors what can be wrong with it....


Televisions covered: all Projection with yellow picture, but not Projection TVs with a yellowish tint surrounding objects in a nearly normal picture.

Yellow = red + green
normal picture = red + blue + green (RGB). See illustration.

12_27_2011_5_00_56_am.png

Fig. 1 Additive color mixing in an RGB monitor, or RGB Projection TV.

The circuitry powering your blue output, or the blue light engine itself is starting to fail.

Operating Theory:

The lamp module shines a bright light into the optical unit; there are a series of lens and baffles, and at the top of the light engine, a lens puts the picture into a mirror which is reflected onto the screen; All video and color is processed thru the light engine. Blue most commonly fails first, leaving a yellow picture.

Dec 26, 2011 | Mitsubishi WS-55805 55" Rear Projection...

1 Answer

Spot in center of screen, if the color pictureis black the spot is blue, if the picture is white the spot is yellow.


Spots in screen is commonly caused by defective LCD on the optical assembly. LCD replacement is very difficult. I suggest to contact the nearest service center at your area.

Oct 09, 2010 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Poor picture no color


OUCH! LARGE DARK SPOT IN CENTER IS NOT GOOD FOR PROJECTION TV. YOU BURNT THE TUBES. THE LOSS OF COLOR IS THE ROOT CAUSE SOUNDS LIKE A DEFLECTION CIRCUIT PROBLEM. THE TIMING FEEDBACK IS USED TO SYNC THE COLOR CIRCUIT. IF THE TUBES LIGHT WITHOUT DEFLECTION THEY BURN THE CENTER PHOSPHOR COATING INSIDE.

Dec 24, 2009 | Televison & Video

1 Answer

62.in hitachi projection t.v. has yellow oval shape in center of screen dark blue color on rest of screen picture fine just color


A discolored Blob, loss of one color or blotchy pattern usually in the center of the screen. The problem is becoming all too common with Hitachi projection sets. What happens is that one of the lenses in the optical block (or light engine) starts to burn or discolor due to overheating because of a blocked air filter causing poor air (cooling) circulation. Nothing can be done when the damage is too far-gone except to replace the light engine-at a cost that makes it not worth repair. if the damage is minimal than to reduce further damage, the air filter should be replaced. The Light engine needs to be removed in order to replace the air filter. Be sure to vote/rate me if this helped Thanks!
Also see link:
http://fyshere.blogspot.com/search/label/Hitachi%2050V500%2050%20in.%20HDTV-Ready%20LCD%20Television

Oct 23, 2009 | Televison & Video

1 Answer

Sony 60" LCD projection TV has yellow screen discoloration


It sounds like you have a bad Blue Polarizer in the light path. I'm sorry but that is something you will have to contact a service center for. It's not something you'll be able to do yourself, I'm sorry, but that's the best advice I can give you.

Feb 17, 2009 | Sony Grand WEGA KF50WE610 50" Rear...

1 Answer

Red circle and yellow tint in our white


Hello,
If you have RED color that starts from Center of the Screen,(no red color on sides ) 100 % your light engine is deffective..
In order to solve this issue Replace Light Engine Control Board (also called Driver Board ) attached to light engine.

Good Luck

Do not forget to Rate!!

Dals123

Jan 03, 2009 | Hitachi 60V500 60" Rear Projection...

1 Answer

Yellow haze


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 23, 2008 | Zenith E44W46LCD 44" Rear Projection...

1 Answer

Yellow Haze Center Screen


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...

2 Answers

Yellow spot in center of screen


I have recently developed the same yellow spot problem on my Sony KDF-E50A10  50" LCD television...a large yellow circular hue that takes up the bottom center of the picture and is especially noticeable against a white background.  It has been diagnosed as the optical block (light engine) and without an extended warranty Sony refuses to assist with the repair cost.  Repair was estimated at $1,100 plus tax and travel fees to my home.  So you see, it is not only a Hitachi problem.  You would think they could build something that would last more than two years considering the initial cost of over two grand for the TV !

Jan 03, 2008 | Hitachi 50V710 50" Rear Projection...

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