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Cleaning lenses and mirrors on dlp

I have a Hitachi 60VS810. It is just over 3 years old. gets about 4-5 hours play per day. It has had the bulb changed about 6 months ago which restored brightness. At that time I noticed the face lens of the old bulb had a haze that could be wipped off. I looked in to the opening where the lamp is installed and saw that there was a haze on the surface of the 1 st convex lense. We wiped that off which improved the contrast and clarity of the image a bit. But we still noticed some haze between the lenses. The tech said there was no way to clean the Lense elements. Is that right? This is not a smoking home but my experience with projection TVs over the last 15 years is that mirros and lenses need occasional cleaning. What about the mirror system behind the screen. Can it be cleaned. What can I do to try and restore the original POP to the image that now seems weak and soft not bright and sharp as it was new. I spent alot on this set as you can imagine but the degraded picture quality is causing me to look at a new plasma. I know I should not have to be doing that yet. Thanks for your help.

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  • Anonymous Apr 11, 2008

    Philips PTV 55" Pixel Plus 55PP. Globes replaced 16 months ago. Picture deterioration. Greens seem 'yellowish'. Picture is 'grainy'. Middle area of screen gives impression white light is being shone from the inside onto back of screen. Problem has advanced rapidly over the past few months. Set has been in same position for 2 years. When globes were replaced, Philips technician came back after 3 weeks to 'tune' the unit. Can you suggest a solution, please?
    Chris---Australia

  • spoko803 Jan 03, 2009

    My brightness is up to 90 and picture is still hard to see

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I have found a way to clean these, the mirror is very sensitive and doesn't have a glass coating like a regular mirror and if you touch it with your hand (or in my case my forehead) even the tiniest speck of oil will distort the picture but without touching the mirror you can use a new swifter duster, any sort of cloth or tissue will leave lint. So I dusted the mirror first in case any dust fell then I cleaned the lens and blew them both off gently with air and it works great.

Posted on Nov 06, 2009

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bjac,

You are correct about lamps working or not, but that is the extremes. Over the course of operation all lamps lose brightness as the hours add up. All lamps will lose their brightness over time.

Typically lamps only last at best 6000 to 8000 hours. That is not long if the unit is used most of the day everyday. In addition the cheaper the quality of the lamp, cost and manufacture, the quicker they go down hill.

Assuming that you have a low quality lamp what you are experiencing is normal. You may be able to improve the brightness and clarity of the picture by cleaning the lenses, mirrors and screen. I have a tip at

http://www.fixya.com/support/r4690955-clean_lense_screen_in_projection_tv

This tip is labeled projection tv but is also appropriate for cleaning an LCD or DLP unit.

Thanks for using FixYa and for the great rating.

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If the set is 4-5 years old, it probably has dust on the lenses and mirror.
This can cause a murky picture.
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Good Day, tomdebseth;

If these dull areas are soft ball in size and look kind of like fuzz balls, then more then likely the optical engine (light engine) is defective. This part is a bit pricey, $600.00 to $1,200.00. Since your TV is only 4 years old you should go to the manufacture and to get them to pay for this repair. A DLP TV "light engine" should last longer then that.

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