Question about Samsung 793S 17" CRT Monitor

2 Answers

Blurred picture Hi, When the video cable is out the "No video present" is clear as crystal. When I reconnect the PC the picture is just one mass of blurred colour. Can you help me please. Regards, Dave.

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  • Dave Alexander Apr 28, 2008

    Hi Benimur,

    The monitor does the same on other computers.

    The old valve monitors had a focus resistor on the LOPT. This is what I used to get when the resistor burned out. Techniques have changed and I am at a loss,



    Kind Regards,



    Dave

  • Dave Alexander Apr 29, 2008

    Hi Benimur,

    Many thanks for your help. It all makes sense to me. I will check these things out this week and get back to you.

    I really appreciate your help.



    Dave.

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  • Samsung Master
  • 13,433 Answers

The monitor might be failing, becouse if the resolution would be too high it would show a box like no video present only with Out of sync text instead.

Posted on Mar 22, 2008

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  • Master
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Hi,

Have you tried lowering the Screen Resolution and Screen Refresh Rate of the PC in its Display Properties?

It could be that you PC's current settings are way above what the Samsung can handle.

Good luck and kind regards.

Thank you for using FixYa

Posted on Mar 22, 2008

  • Louie  Role
    Louie Role Apr 29, 2008

    Hi again Dave,

    Appreciate the post back and additional information. Based on all the info at hand, it could then be of four (4) possiblities:
    1. focus adjustment - normally integrated with the FBT. Most current monitors have their Screen & Focus adjustments at the rear of the FBT and accessible through "holes" of the heatsink of the horizontal out transistor. Being a 17inch, it is likely that there would be two (2) focus controls;

    2. video cable - possibly an open wire of either/or both the vertical/horizontal sync;
    3. video interface - this would be the IC controlling the R-G-B buffers/amps. In all monitors, this would be where the video cable ends (inside the monitor). Likewise often (but not allways), this would be in the small PCB at the very rear of the CRT.

    Of course, it is also very possible that any other component would and could have failed. At this point, a service manual or at the very least a schematic is needed.

    Cheers.

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