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Looking For Sharp Picture

Discussion in 'Projectors, Screens & Video Processors' started by djw, May 7, 2003.

  1. djw

    djw
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    HI
    I had a workmate looking at my 420hb last night he said my crt was out of focus when he put on the cross hatch pattern he pointed out the lines where not crisp he works with lcd pro he thinks the drives are set to high.can anybody help.
    THANKs DJ:confused:
     
  2. nathan_silly

    nathan_silly
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    Why post twice?

    There will be two methods of focussing- optical and mechanical. Loosen one lens wingnut (say Green first) slightly and rotate clockwise/anticlockwise until it's most in focus. Then adjust the Green focus pot and see if that brings it further into focus.

    Do the same for Red & Blue.

    You will need to reconvergece the blue & red to the green.

    The electronics in a CRT PJ can kill. So either be very careful (use one hand at a time) or get a techie to do it.
     
  3. djw

    djw
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    NATHAN
    THANKS for your reply. SORRY about second/post guess Im going or have gone GAg gaa.
    THE guy that installed the projector is coming out this week I see what he can do.
    thanks DJ.
     
  4. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    400/420 etc look soft due to lens's used. Even with correct mechanical and electrical focus they will not look as sharp as your guy is expecting.

    Remember blue is supposed to be de-focussed and DON'T TOUCH THE G2 POTS beside the focus ones

    Gordon
     
  5. Roland @ B4

    Roland @ B4
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    LCD people love to see lines and dots on the screen its the only way they can tell their image is in focus.

    When you look at the grid, try turning the contrast down a bit at a time to see if that improves the focus of the grid.
    If it does you are probably overdriving a bit. and need to reach a point where you are happy with the light out put and sharpness of the picture.

    If it doesn't take a look carefully down the lens and see if it is sharp on the tube face. (the blue should always look a bit fussy).

    If its sharp on the tube face then you need to refocus the lenses (back wing nut does the middle, front does the caoners)
    If its not sharp on the tube then the electostatic focus needs adjusting.

    Have a look first.
     
  6. GagHalfrunt

    GagHalfrunt
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    Duplicate threads merged and tidyed up
     
  7. Chris Frost

    Chris Frost
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    Some people think that DLP looks soft compared to LCD too. Many of these differences are due to the way each technology makes its image.

    420s have their limitations, but ask your mate to bring his LCD round to your house and compare contrast, black level, shadow detail and colour fidelity. He'll find the boot is on the other foot. :)

    Regards
     

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