Cooling Fans in most RPTVs?

Discussion in 'Displays' started by Arthur S, Dec 27, 2003.

  1. Arthur S

    Arthur S Cinematographer

    Joined:
    Jul 2, 1999
    Messages:
    2,568
    Likes Received:
    0
    Trophy Points:
    0
    I found out that there are fans in the Hitachi S700 series and the noise in quiet scenes is enough to drown out dialogue. How common are fans in RPTVs?

    Is it only for those that have a HD Decoder built in?

    Thanks

    Artie
     
  2. Neil White

    Neil White Supporting Actor

    Joined:
    Jan 8, 1999
    Messages:
    551
    Likes Received:
    0
    Trophy Points:
    0
    There's an HD decoder in my Sony KDP-57WS550 and no fan as far as I'm aware.

    N
     
  3. JimmyJK

    JimmyJK Agent

    Joined:
    Nov 25, 2003
    Messages:
    26
    Likes Received:
    0
    Trophy Points:
    0
    most in my experience are the 80 mm flavor fans Ialways switch them out with panaflo L1A's whisper quite and have great CFM.
     
  4. Steve Schaffer

    Steve Schaffer Producer

    Joined:
    Apr 15, 1999
    Messages:
    3,756
    Likes Received:
    1
    Trophy Points:
    0
    Arthur,

    DLP and LCD based rptv's use a high-intensity bulb to produce light which shines thru the lcd or dlp panels to produce a picture. These bulbs produce a lot of heat and thus need cooling fans.

    DLP sets also contain a motor driven color wheel, which may also produce some noise.

    CRT based rptv's don't use cooling fans, as they use an array of 3 cathode ray tubes to produce the picture. These are "liquid cooled" and don't require fans.
     
  5. Arthur S

    Arthur S Cinematographer

    Joined:
    Jul 2, 1999
    Messages:
    2,568
    Likes Received:
    0
    Trophy Points:
    0
    Steve

    The Hitachi s700 series are CRT based and there is a thread out there where people who bought s700 models actually saw the fan when the tech came to check out the noise.

    Again, my guess is that it is needed to cool the built-in HD Decoder. If I am not mistaken, the short lived RCA 38" had a fan, and they were told by RCA it was there to cool the HD Decoder box.

    I wish I were wrong about this cause the ones with the HD Decoder built-in only cost about $50 more than the same model without the decoder.

    Thanks

    Artie
     
  6. Steve Schaffer

    Steve Schaffer Producer

    Joined:
    Apr 15, 1999
    Messages:
    3,756
    Likes Received:
    1
    Trophy Points:
    0
    Artie,

    My bad. You are probably correct in assuming the fan is there to cool the HD tuner.

    I could be wrong but I was under the impression that the built-in Hitachi HD tuners were ota-only, in which case you would still need a cable or satellite box to get any HD content other than the broadcast networks (i.e. HBO, Showtime, Cinemax, ESPNHD, Discovery HD, HDNet, INHD, etc. would not be available on the set's tuner).

    The built in ota HD tuners will not tune cable HD, which uses a different broadcast standard vs ota channels.
     
  7. Arthur S

    Arthur S Cinematographer

    Joined:
    Jul 2, 1999
    Messages:
    2,568
    Likes Received:
    0
    Trophy Points:
    0
    Steve

    My understanding is that the Hitachis can handle HD Cable feeds unless the cable signal is scrambled.

    Thanks

    Atie
     

Share This Page