Question about Akai PT4298HD Rear Projection Television

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My Picture is in Red and Green??

I'm a newbie to this board and this is my first HDTV. I recently purchased a used AKAI PT4298HD and everything has been awesome until this morning. The picture looks like it's in 3D with only red and green colors showing. You can still make out a picture. Is my tv toast?? I can use any advice you guys can give me!! Is this an easy and inexpensive fix?? PLEASER HELP!!

Posted by Hongsing Phou on

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Vista Electronics

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Be sure to check any/all soldered-in pico fuses in power supply

circuitry.Also,STK392-040 IC replacements should be first quality== I use Panasonic with no re-calls.

Posted on Oct 18, 2007

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This is a convergence problem. From your menu, go to Menu, Function, Convergence and then use you remote to try to adjust your colors. If you can not get them to line up this is a problem with the convergence board. The convergence amps (STK392-040 x 2)are internally shorted. These can be replaced or the whole convergence board can be replaced. It's cheaper to replace the amps, but more convienent to replace the board (especially for the less electronically inclined!! :) Hope this help you out....

Posted on Oct 06, 2007

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Red green wavy color on top of picture with distorted faces and bottom of picture seems o.k.

Ur convergence is dead.The Convergence board must repair or replaced.Samsung/Akai use the same convergence board.Try website Tv repair world.com.Buy the whole board replaced it the best.
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Akai

Yes it does, makes a lot of sense. you have the typical convergence amp problem that plagues almost every projection set ever made. What you need to do, and only if you have experience working on solid state printed circuit board, is to locate the STK type amp IC's, order new ones along with heat sink compound, and unsolder the old IC's and reinstall the new IC's, but do not forget to put a good coating of heat sink compoud on the backs of the new IC's before you install them. Like I always say, if you have no printed circuit board experience, or do nor solder well, play it safe and call out a pro to assist you in this easy repair. Good Luck
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54" Projection TV

Your green gun in our tv is misagligned/out of focus. Your tv uses red, green and blue guns that layer in different shades and mix to create the different colors. Your green is a little off so the colors aren't mixing right which explains the green haze and the shadows. A tv repair man can fix this problem pretty easily and it isnt expenisve.
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Convergence problem: Green won't adjust

You will need to replace both STK392-040 ICs you can get replacements at the following link with free instalation instructions
http://servicemanuals.vstore.ca/
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You may need the change the coolant in the blue tube. Convergence is when the picture will look 3D Let me know if you need more information.
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yep you need convergence amp replacment for your set..very common prob call experienced repair person for this job use original replacements....john
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Akai tv

have a good tv guy repace you convergence amp's john
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I need to see a picture of the TV set. send a photo to [email protected]
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AKAI PT4298HD

If you have a good picture except for a missing color all the various circuits are working OK. Most likely you have a bad solder joint or component in the red circuit. This would also be indicated by the fact that ocassionaly the red pops in. If you have the experience remove the boards and inspect for cracked or cold solder joints. Resolder anything that looks suspicious. If this does not fix it you will have to troubleshoot the red drive circuits from the CRT back to the video IC. Another possibility is that you have a bad/intermitant red crt. I doubt that you have the equipment to check this but you can test it by moving the green crt board to the red crt. If it now works the red crt is OK. If all this fails you will need to find a reputable repair shop to look at it. If the unit is more than 5 years old it may not be worth fixing. Good luck.
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