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Panasonic TH42PW6 EX and powerbook g4 -how to get the plasma's native resolution

Discussion in 'Plasma TVs' started by icetiger, Jul 28, 2005.

  1. icetiger

    icetiger
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    Hello everyone

    I use a Panasonic TH42PW6 EX. I also use a apple powerbook g4 mith ATI 9000 radeon CHIP and DVI output.

    the plasma and the powerbook are connected via
    powerbook -> DVI -> DVI/VGA Adapter -> vga cable -> plasma.

    My question:
    how to set up the native resolution (852 * 480) in this combination?

    The powerbook gives me many options:
    640 * 480 different scan rates
    800 * 600 different scan rates
    1024 * 768 different scan rates
    ... up to 2304 * 1726 76 hz

    I want to use it for DVD-video play back and right now I go with
    1600 * 1024 at 76 hz, what brings a surprisingly clear and crispy Image (wonder how the panel does it's synchronising).

    any ideas to get he native plasma resolution activated?
    do I need to change the connection (maybe need an upgrade panel for the display)

    Thanks for suggestions

    icetiger
     
  2. stevelup

    stevelup
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    Hi

    After much experimenting, I settled on 1280 x 720 resolution to feed the SD Panasonic panel.

    This res has a couple of advantages.

    1) It's the correct aspect ratio
    2) 720 / 480 = 1.5 - A nice easy ratio for the onboard scaler to cope with.

    I don't see any real advantage in going native as your computer will be virtually unusable with only 480 lines to play with.

    Steve
     
  3. stevelup

    stevelup
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    Hi

    A couple of other things...

    Refresh rates. Try to make sure the refresh rates are a multiple of the refresh rate of the source material.

    PAL 50Hz (25FPS) - Aim for 75 or 100Hz
    NTSC DVD with pulldown removal (24 FPS) Aim for 72Hz
    NTSC Video (29.97 FPS) Aim for 60, 90 or 120 Hz

    This will prevent judder.

    If you're having trouble finding the right modes, you need switchResX.

    Steve
     
  4. nak

    nak
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    Hi chaps,

    Just to confirm I am running PC at 1280 x 720 through a DVI-D board.
    Absolutely no probs.

    Did take me a long time to sort out though (what with XP rebooting all the time!)

    Can't stop watching those trippy Winamp visualisations!!!

    :hiya:
     
  5. icetiger

    icetiger
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    @ stevelup

    thank you very much for your hints... I tried it last night, it worked fine, brilliant picture, stable frames...

    could you please explain the difference in the refresh rates? Is there any remarkable difference in 60Hz to 100Hz while playing a PAL-DVD?

    I configured the 100Hz, what you suggested, but I believe, the computerpicture (while running a software applikation) is somehow more colorful with 60Hz. (just a little bit, maybe it's just my eyes...)

    Thank you
    icetiger
     
  6. icetiger

    icetiger
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    @ nak

    what DVI-D board do you use? I understand there is no such option for a TH42PW6? That's why I connect via analog VGA cable...

    Thanks for answering
     
  7. stevelup

    stevelup
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    Hi

    With regards to refresh rate, the key is getting the refresh matched to a multiple of the source material.

    60Hz is bad for PAL because 25 does not divide by 60. You will therefore see judder.

    Whether 75 or 100Hz is the right choice I can't answer - just use which looks best to you. 100Hz will show up inadequacies in your cabling more readily than 75Hz

    With regard to the DVI-D option, TY-42TM6DB is the part number for the input board.

    Regards,

    Steve
     

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