Question about Akai PT4799HD Rear Projection Television

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I am seeing multiple colors in the picture of the TV. Almost like a three D rainbow. looks like spiders are in the corner of screen discolored picture white and blue squiggly lines  screen turns off and on

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  • Akai Master
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Replace your STKs they are your convergence ICs STK392-110s use the 180s.

Posted on Jan 10, 2009

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Colors in left upper corner like a rainbow and fuzzy warped picture with lines that will run thru the picture from time to time, majic focus does not clear this up and I can not get the color set...


All projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both.

Common Problem #1) Convergence has gone out

Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some pics of convergence problems.


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Common Problem #2) CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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69189a5.pngSOLUTION

You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Jan 06, 2011 | Hitachi 50SBX78B 50" Rear Projection...

1 Answer

Double screen and rainbow like colors


my media player does not play occur eror in error show capture video failed, show no sound device or show input is failed

Feb 27, 2010 | RCA Projection Televisions

1 Answer

My sony KP-46WT510 the color in three corners is blured and the picture is bowed.


Hi,it seems you are experimenting a light engine problem.This is how your tv works: http://www.youtube.com/watch?v=ZLLHnQ4y-wo So basically the 3 Lcd chips that create the colors and image is going bad and thats why you get that color discoloration.Contact Sony or look for your light engine online.God bless you and your house!

Nov 18, 2009 | Sony KP-46WT510 46" Rear Projection HDTV

1 Answer

There are flickering, rainbow-like color bands running across the screen, especially in the component inputs, not so much using the HDMI input, but still there.


Hi,if your tv is and Lcd rear projection it will be the light engine that needs replacement.Because lcd technology uses 3 chips green,red and blue that create the image and colors.When they start to fail you will get what you are getting color discoloration and rainbows.If your tv is DLp it will be the dmd chips which basically its like the lcd chips but instead of 3 chips its only one that creates the image.Hope this works God bless you!

Oct 06, 2009 | Mitsubishi WD-62525 62" Rear Projection...

1 Answer

Jvc 52 inch tv. the picture on the upper left corner drops and is discolored


Hi if your tv is a Dlp or Lcd it will be a problem with the light engine.Basically there's 3 chips green,blue,red that create the image and colors.When they start to go bad or melt you will get color discoloration on corners on the center.You will need to replace the optical block ,you can find it on www.discount-merchant.com www.shopjimmy.com or ebay .Have a blessed day!

Oct 01, 2009 | JVC Projection Televisions

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...

2 Answers

Rainbow on the screen


Do you have any larger speakers close to you tv. Or any magnets been neer it. If you unplug it for a while the tv should have remove the rainbow

Aug 28, 2008 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

Mitsubishi WS-48613 No Video


If you have no video and audio then IC9c25 on Sig. Bd.

Jan 14, 2008 | Mitsubishi WS-48613 48" Rear Projection...

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