Question about Akai PT5598HD 55" Rear Projection HDTV-Ready Television

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HD image has lost sharpness

My 4 year old PT5598 has suddenly lost image sharpness. Automatic convergence adjustment using 'Perfect Focus' has no effect. White areas on the screen appear slightly 'muddled' with small 'particle like' grey spots. This is present in all colours, but is more noticeable with whites. Any ideas?

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  • CLW Jul 07, 2008

    Thanks for the prompt reply! Should I change the whole convergence board or just the IC's?

  • CLW Jul 07, 2008

    Thanks Abrsvcs; repair estimates are easy to obtain, but if the repair involves more than swapping out a board or two, no one is interested in making them...
    I check for dust first; try a manual convergence and take it from there.



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This is not a convergence problem. Either the guns are out of focus (not likely) or the fluid in the CRTs has become contaminated. You should be able to get a detailed repair estimate for under $100. I would recommend that course of action as trying to diagnose this without seeing the screen will be difficult. From your description, I am leaning toward contamination.

Dan

Posted on Jul 07, 2008

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You will need to replace the convergance IC's if the colors are no longer lined up and they won't line up using the tv's controls. Also, if the crt lenses have a lot of dust on them removing that will help the sharpness and brightness of the picture. Don't use canned air. Get a crt lens cloth.

Posted on Jul 07, 2008

  • Frank Gant
    Frank Gant Jul 07, 2008

    Just the IC's. But only do this if you see ghosting etc. If it only looks like the brightness is gone, or the colors are not as bright it'll likely be something else. IC's are only for lining up the colors.

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Let me assume you adjusted the convergence in the customer mode--it does on any of the HD models have to be adjusted in the regular and then the HD modes.

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