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Hitachi 50V500 light blue shadow problem follow-up: Hi, I just wanted to explain the sequence of events that led to the "light blue" shadow problem to rule out anything else other than the light engine replacement for this unit. Three weeks ago the TV was working perfectly fine with great color and clarity then all of a sudden the lamp light came on solid red. I tried turning the TV on and no picture. I read the manual and replaced the bulb. Still did not work. I asked fixya and was advised it was the ballast. I replaced the ballast and everything is working great except that the picture is good not great. Light blue shadow now appeared which was never there before. Light engine was replaced previously 4 years ago when TV was under warranty. Can this still be the light engine again? Thanks.

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  • chinds840 Apr 25, 2010



    Thanks for your reply.I never did actually replaced the lamp. I bought a new lamp thinking that was the problem, but actually learned it was the ballast. So, I kept the new lamp in my garage and have my original lamp in my TV.I can't figure out why this blue shadow appeared when I never had it before.All I really did was replace the ballast and test both lamps (new and old) to see if they were working in another Hitachi TV 50V500. If it still sounds like the engine lamp to you my question is how many years do engine lamps last? I ask because at this point it might more sense to purchase a new TV rather than replacing engine lamps every few years.



    Thanks again.

  • chinds840 Apr 25, 2010

    Hello,



    When you say displaced mirror do you mean a mirror that needs adjusting rather than a mirror that is damaged and needs to be replaced? Also, the shadow problem is very light blue in color for an Hitachi 50 in LCD TV. I believe the link you sent said that the shadow had to be dark and for a projection TV. Bottom line it sounds like the light engine is failing, correct?



    Thanks.

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Yes it can be the light engine but, before you spend money you may not need to: look at the old ballast part # make sure the # matches the new ballast also check the electronic label for the correct values: volts watts amps etc. If you know how, safely: check your power supply to the ballast, as; I have gotten the "blue halo" before on a hitachi set when the ballast manufacturer was changed and, the replacement part was not made by the manufacturer.

Posted on Apr 25, 2010

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Hi.

Shadows are not caused by lamp faults. It is a problem related to the optical group, usually a displaced mirror in the light tunnel.

I have written an article on the problem here: Rear projection TV displays a shadow on one...

The light tunnel is an expensive part. As first thing call Hitachi at the number listed on the manual, and ask conditions for repair.

Here the contact: Contact Support.

Please do not forget to leave feedback.

Regards.

Posted on Apr 25, 2010

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Hi,
I think picture was not so bright with old lamp and that is why blue shadows in picture were not noticeable.
After lamp replacement, picture becomes brighter and blue shadows become more prominent.
It is just my opinion.

Required light engine is available HERE. Click that link to see an image and price info.
Thanks.

Posted on Apr 25, 2010

  • Shahid Electronics
    Shahid Electronics Apr 25, 2010

    Yes, its light engine problem because it consist of 3 lcds and few color filters.
    Blue lcd and related filter got marks due to heat of lamp and you see it as blue shadows.



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