Question about Akai PT4298HD Rear Projection Television

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Akai hello, I have a AKAI model pt4298hd the blue green and red lights in back work fine however the red bows giving a double picture kind of like looking at a 3d show on all channels, make sense?

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Re: 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

Posted on Jul 31, 2007

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Double vision w/ red & green tint

This is a comon problem
There are two large convergance chip's
the are failing .Replaceing them will
corect the problem . The chip range
in cost from 16,00-30.00 .There cheap,
so dont let the shop over charge you
for parts when and if you decide to
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Jul 03, 2009 | Akai PT4298HD Rear Projection Television

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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.

Apr 25, 2008 | Akai PT4298HD Rear Projection Television

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Your convergence ICs need to be replaced. Its an easy job if you can solder. Let me know if you need any more info or a link to where you can order replacement ICs.

Apr 06, 2008 | Akai PT4298HD Rear Projection Television

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More than likely your akai has defective stk392-040 Convergence chips . it also may have open resistors generally 3.9 ohm flame proff. this board is attached to the top left looking from the back of the set it is screwed on by 1 screw black in the center . after installation this will probably half to be converged dinamically. which means you will half to get to the grid this is done by using the remote press mute 183 quicly to enter numbers on thew remote 2 to adjust red 4 to adjust blue horizonta 6 to adjustred vertical and 8 to adjust red vertical using center button to go up and down

Feb 20, 2008 | Akai PT4298HD Rear Projection Television

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Obvious circuit problems. Take to pro/tech for check and repair

Nov 07, 2007 | Akai PT4298HD Rear Projection Television

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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

Jul 31, 2007 | Akai PT4298HD Rear Projection Television

1 Answer

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have a good tv guy repace you convergence amp's john

Jul 31, 2007 | Akai PT4298HD Rear Projection Television

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Jun 05, 2007 | Akai PT4298HD Rear Projection Television

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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.

Jun 02, 2007 | Akai PT4298HD Rear Projection Television

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