Question about Sony Grand WEGA KF-50WE620 Television

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Hi, There is a huge yellow circle in the middle of the screen surrounded by blue color. Is this a lamp default or do i have a bigger problem in my hands? please advise.

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Light Engine 1-800-638-3328

Posted on Oct 14, 2010

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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

After replacing the bulb, we had a blue colored shape in the middle of the screen, it has now changed to the color yellow and has become larger. I am curious as to what that means?


I don't have a solution but I just purchased the exact same thing which arrived a week ago and I have the same problem. I just have a blue shape in the middle of the screen shining through. I called SONY but they were closed for the day. Trying to find a solution on-line. Maybe we got a bad batch of lamps??

Oct 10, 2010 | Sony (XL-2400) Projector Lamp for...

1 Answer

Blue circle in the center of picture


I need to know what color you got the circle in because one of your lamps went out and needs to be repaired this circle is only going to get bigger an bigger and shall i go on? Easy fix buy the new one and have it put in around $90 bucks plus labor.

May 24, 2009 | Hitachi 46F500 46" Rear Projection...

1 Answer

Blue circle of color in middle of screen


This is your Light Engine that is defective. They usually cost in excess of $700.00 to replace. Not the Lamp.

May 02, 2009 | Televison & Video

3 Answers

Green spot in middle of image as though a spot light was shinning on the screen. I've replaced the lamp


Welcome to LCD 101, the blue device is dying in the projector. Replace product with dlp brand and it will last a lifetime. good luck

Apr 14, 2009 | Epson PowerLite® 1700c LCD Projector

1 Answer

Big yellow spot in the middle of the screen


the lcd panel for the blue is bad normally you would have to replace the engine but i know a place where you can get it rebuilted for a price cheaper than the engine go to
N-home tvservice.com for some answers

Mar 02, 2009 | Hitachi 55VS69 55" Projection HDTV

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Changing the lamp on a DLP LCD tv


Most definitely! The lamp is a consumer replaceable item and your owners manual should have instructions on how to complete this task. If you don't have your owners manual and more post your model number and i will get you some instructions on how to replace it!

Tim Nolan

Sep 24, 2008 | Televison & Video

1 Answer

I have a hitachi projection tv that has yellow areas on the screen. tv repair guy says it is the engine. does this make sense? in checking tv repair on line it seems to me to be the projection lamp. does...


When tv has a blue or red or yellow circle in middle of screen and it is very faint looking in most cases it is the light engine.
The cost is 650,00 plus labor. In some cases it could be the color wheel. but rear .
The lamp is not the problem


thanks doctor video leading edge electronics snce 1987

May 08, 2008 | Televison & Video

1 Answer

Image has big yellow


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.

Apr 22, 2008 | SharpVision XV-Z1U Multimedia Projector

1 Answer

Yellow circle


The huge yellow circle is either your blue filter is burnt out (very common in Zenith DLP) or you LCD cube is bad. I would bet it is the blue filter. Zeniths DLPs have 3 color filters one blue (a pinkish color), one green (a grayish brown)and one red (it is red). For the bulb indicator I would check and make sure your lamp is seated to the ballast correctly. Just take it out and put it back in.

Mar 24, 2008 | Zenith E44W46LCD 44" Rear Projection...

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