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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6ya6ya
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Rainbow colors from bottom of screen to top corners


Check its degaussin posistor. Replace it. This component can be located at the main power regulator section.
Picture of the suspected component attached.
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May 23, 2012 | RCA TruFlat 27F520T 27" TV

1 Answer

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

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

2 Answers

Rainbow screen, no color, tv fell over


ur tv needs to be degaused using a degausing wand or ring. mos def needs to be taken to a professional to be done.

May 18, 2009 | Zenith SY2765S TV

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

Sudden color/picture distortion


you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.

Feb 25, 2008 | Samsung TX-R3080WH 30" TV

2 Answers

Color rainbow in picture


Your problem sounds like someone got a magnet too close to the CRT. This can be removed with a degauss coil (which you probably do not have) or it will eventually go away if your built in degauss circuit is working. Everytime you turn on the set the circuit degausses the crt so colors can be displayed properly. If the circuit is not working you will need to have a tech repair it.

Jun 16, 2006 | RCA F27665 27" TV

1 Answer

Rainbow colors after a lightning storm


you need to borrow or rent from a repair shop a degaussing coil. Its a big coil of wire that plugs in and has a switch on it. How you use it? With the coil plugged in,but not switched on ,hold the coil in front center , about two inches fron the picture tube. Now switch on the coil and slowly rotate the coil in a circle all the way around the picture tube and at the same time pulling slowy away fron the front of the picture tube. Keep doing the circular motion till you reach about three feet from the front of the tube, turn the coil sideways fron the tube and quickly shut off the coil. This is done with the tv set on. The set should look clear now ,with no color blotches on the corners or the rest of the picture. If it dosent then the pictre tube is bad. If it does look good, shut off the tv set for a hour or so , turn back on the tv set, Is the colors back on the screen. Yes , then ther thermistor or degaussing circuit needs to be serviced, and this is something you will need to call in a tech to service for you cause theres extremly high voltage inside these sets and not for a handi-person to tinker with. But if its good then your all set. Good Luck

Jun 14, 2006 | Samsung TXN2771HF 27" TV

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