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Cloud on rear projection TV screen

Discussion in 'Electronic Repair' started by moonlite, Jun 7, 2005.

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  1. moonlite

    moonlite Guest

    Hello folks- A customer complained about a "cloud" on his 52" RPTV. I
    checked the TV and saw that he indeed has what looks like grey dirt,
    which looks like a cloud. This dirt is visible only on bright scenes. I
    cleaned the screen and the lenses (outside only) without success. Can
    dirt inside one of the lenses cause this ? Or, is it possible dirt
    somehow found its way inside between the fresnel and the outside screen
    ? Or maybe his cleaning habits did permanent damage to the lenticular
    screen ? One thing is for sure: the "cloud" is there. I'm trying to
    avoid any unnecessary disassembly. Thanks for your opinions.

    moonlite
     
  2. James Sweet

    James Sweet Guest

    Dirt can get between the two screens or on the mirror, also bacterial growth
    in the coolant is fairly common but when that happens it usually doesn't
    affect all colors the same, generally green and blue get cloudy.
     
  3. Art

    Art Guest

    Seen results of customer induced damage due to smoking, use of candles, use
    of fire place, dust and debris blown about by forced air heating/cooling,
    dust from local construction, etc. Occasionally the material will get
    between the fresnal, lenticular, and even protector screen. When it does
    collect on the screens it may not necessarily be in any particular pattern,
    however I've seen many where it tends to produce the "Cloud" or "Halo"
    effect. Sometimes the material may be cleaned off with application of
    appropriate cleaners and techniques, requiring removal and disassembly of
    the screen assembly. This causes other problems because most customer
    residences are not "Clean Room" specific. That is, by cleaning and
    reassembling the screens in the average atmospheric conditions within a
    normal home, dirt, dust, etc will end up between the screens, probably
    producing another unwanted effect. Normally in these conditions we tall the
    customer what the costs of a new screen assembly (All 3 items) will cost
    them including labour. Never have seen this caused by the mirrors, yet, but
    have seen fluid in SONY and PHILIPS branded products have bacterial growth.
     
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