Question about Akai PT4298HD Rear Projection Television

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Fuzzy Blue...? Hey guy's. I just got a used PT4298HDX. Replaced the convergence board to fix my alignment issues (partstore.com, thanks) and did the manual allingment. Red is great, but... the blue is fuzzy. I tried the "perfect focus" and the red and green fly through, but it stops at 47% right when blue starts. The red and green are real sharp, but when is adjusts the blue, the lines and squares are just a blurr... Do I need a new projector lamp? Why would only the blue be messed up? Thanks in advance...

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  • Steven Carpenter Mar 14, 2008

    Is that practicle for me, or should I just get a new lamp?

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These set are bad about the blue tube messing up.. what happens is the convergence board witch generates alot of heat cooks the blue glycol.... basically growing algea in the blue tube... it is possible to remove the tube.. and remove glycol and clean the tube then replace and adjust..i have done a few here at the shop

Posted on Mar 14, 2008

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2 Answers

I have a Toshiba CT-90121 and my convergence is off. I can adjust the blue and red in the menu but cannot aline them with the green crosshairs. Do I need a new green projector or something else?


You need to remove the convergence Board and repalace the convergence IC's and and replace electrolytic caps and check for resistors that have changed in value. You can getb the parts at www.mcmelectronics.com com or just purchase a new board at www.partstore.com .

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The red lens on my projection screen dose not seem to line up right the picture is fuzzy and it will not moveback in alignment with the remote


Tv board call the Hyper board also known as a tv convergence board it is dead.Tv have any R,G,B colors lines mis alignments,have colors shadows pictures or 3D pictures look alike?Yes,than the tv convergence must have it parts to be replaced like 2 STK convergence ICS and some or all of it resistors too.To fixed the the Hyper board also known as a convergence board will fixed tv picture convergenece problems.Tvs shops will cost u like $300-350 for parts and labors.

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I have a PT-53WX53 CRT rear projection widescreen tv. The guns off and the red and blue are no longer aligned. I tried to adjust with the 9 point convergence correction but it only helped a bit. I know...


Convergence + - don't alignment or some mis alignment anywhere in the picture.The R,G,B colors lines don't move any of the color line.The tv convergence board have dead parts.The 2 STK convergence ICS and some or all it resistors are dead.These parts on the tv convergencce board,must be replaced to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.

Oct 27, 2010 | Televison & Video

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Our tv just started having a fuzzy image and the auto focus function aborts during the red color alignment. is there a manual alignment I can do to fix it.


What does this fuzzy image look like? Does it have ghosting shadows. Of course it is possible to align red manually from the convergence menu. But first lets confirm that it is indeed a convergence related problem.

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Akai, pt4298hdx-sms 2003, it has two colors and in waves


the convergance ic's have failed they are stk392-110 you will need 2 and they run around 24 to 25 bucks a piece you can get the complet convergance board for around 75 dollars on that set it is located up mounted to the crt bracket try partsearch.com of shopjimmy.com

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Unfortunately you will have to replace the convergence board in this unit. it has failed. this particular board regulates the alignment procedure that you are having issues with. replacing this board will fix this issue.

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1 Answer

Color alignment problem


You will need to put the unit into wahts called service mode because it will have to totally realigned since you change the whole module you changed the chip that had you stored memory setting for convergence called an EEPROM. here in the shop I would unsolder the old EEPROM and put it on the new BOARD. Also on most models you don't have adjustments for the green you have to move red and blue to match green. Imay want you to describe again to me what you can adjust now with the new board in the unit can you move all colors left right and up/down

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1 Answer

Samsung HCN4226W blue color outlines


Samsung parts for convergance problem
http://www.partstore.com/Part/Samsung/Samsung/BP9500142E/New.aspx
This convergence board works with the following Samsung television models: HCM4215W, HCN529WX, HCN559WX/XAA, PCN5425R, HCN4226WX, HCN529WX/XA

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Blue convergence wont align left and right


I'm having the same issue but with Green. Check out this guys blog he had a similar problem and fixed it.
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-i.html

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