Question about InFocus LP640 Multimedia Projector

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Red Color After about one to two hours of non stop use the color red is no longer being projected onto the screen. Is this a failing lamp or some other problem?

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Lcd panel failure or bad main board. either way, you'll have to send it in for repair.

Posted on Dec 29, 2009


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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.


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

My LCD projection tv(KF-50E200A) displays projection lamp week when switched ON and out of red color display on the screen. Is this will happen if the projection lamp is week?

no and yes
the lamp warning is to alert you that a timer has expired that clocks the approximated life of the lamp in "hours of use".
it is never accurate and is dependent on whether or not it was reset the last time a lamp was replaced.
reset the lamp timer in the users "setup" menu.

the lamp has NOTHING to do with color, it only provides light.

check the connections between the TV and cable/satelite box...the component connector...the red one is likely loose.
if this does not correct you color problem, your optical engine has failed.
very expensive repair, not for the DIY type guy.

Apr 17, 2011 | Sony KF42E200 TV

1 Answer

My screen has little dots appearing sometimes red sometimes blues behind the picture i just replaced the lamp bulb as i thought it would cure the problem

the projection tube needs to be adjust for color alignment, each tube (red, green, blue) must be aligned so you there would be no color smear appear on screen. if it is aligned try to set up the color balance, hue etc.

Feb 06, 2011 | Samsung Televison & Video

2 Answers

Green screen

inside the light engine there is a red a green and a blue glass color filter.The heat from the lamp causes the color to burn off the glass.You need new filters .One is red one is blue and one is green.The lcd itself doesnt make the color,it is a black and white device.The colr comes from light shining through colored glass

Nov 11, 2009 | Hitachi 42V715 Rear Projection Television

2 Answers

I have a toshiba 65hm167 no red color on the screen

Your TV is a DLP one lamp does it all, not like the old projection TVs with the Red, Green & Blue CRTs. Your TV may have a bad light engine or lose cable connections.

Good luck
N Sabre

Nov 08, 2009 | Toshiba 65HM167 65" Projection Television

1 Answer

RCA DLP TV with a red dot in the middle of the screen

Sounds like the color wheel stopped and re-started. It may continue to function for a while, but could fail at any time.

I've also seen on rare occasion, a defect in a lamp produce uneven color rendition, but its far more likely that the culprit is the color wheel.


Feb 13, 2009 | RCA D52W19 52" Rear Projection Television

1 Answer

Red circle and yellow tint in our white

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!!


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

1 Answer

Infocus 4805 blinking red light problem

My first questions is:

Is this the first lamp you have placed into your Infocus pj? If not, did you reset the hours when you did it last time? Otherwise that can also confuse the projectors internal system thinking there is NOT a new lamp in there and there for make it stop working once the clock hours are expired and over the 3000-6000 suggested hour life.

Let me know so I can help trouble shoot other possible problems.

Oct 27, 2008 | InFocus ScreenPlay 4805 Multimedia...

2 Answers

Green screen and shut down

TV screen flashes with Red lights for few times. sometime it shut down TV or red color is lost showing pictures without Red looks terrible. Any solution

Sep 17, 2008 | Sony KP-51HW40 51" Rear Projection...

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