Question about Samsung SyncMaster 753S 17" CRT Monitor

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Focus on monitor

When there is no input to the monitor the sign "No video input" appears very clearly on the screen. When I put the video in the whole screen seems to go completely out of focus and leaves dark bands of colour horizontally across screen. Samsung SyncMaster (793s)


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  • Dave Alexander Oct 02, 2008

    Thank you seslu666. This week end I will try your suggestion and

    get back to you.


  • Dave Alexander Oct 05, 2008

    Thanks sesylu666,

    Can youn further assist by giving me the location of these filters. I dont have a circuit drawing.

    Many thanks

    Dave (6770)

  • raja 56 Dec 04, 2008

    I have Samsung Sync Master 793s 15" monitor of 2004 September Model.

    Until a week ago time taken to display is instantanious, when the monitor is switched on, but now it takes around five minutes for the display.

    Plz. tell me what could be the problem and how to fix it .



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Try replacing the filter capacitors on the video circuit.

Posted on Oct 02, 2008


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Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 1. Turn the green screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
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Until the point where you can see the retrace line disappears, just before cutoff.
3. Turn the blue screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
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For electrical the focus, put on the screen a clear picture of your choice thru an input of the TV set from a DVD, then pause the playback of the DVD Look into each color and rock that color focus control back and forth (turn the control one way then the other way slowing down as the picture goes into the best focus. till the picture looks sharp do each color till they all look in focus. NOTE: it is best to look into each color tube to achieve the best electrical focus. For optical focus please follow the manual lens adjustment in the sets service manual
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Your monitor provides a self-test feature that allows you to check whether your monitor is functioning properly. If your monitor and computer are properly connected but the monitor screen remains dark, run the monitor self-test by performing the following steps:
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Western digital world edition 2

My amigo , your monitor is most likely gettin old , Operating systems and video cards do not blur monitors unless you ordered them to do so , I'm a fully qualified monitor technition this stuff happens all the time , basicaly it's the focus block of the monitor , if it's not serious you're lookin at a few bucks to have it worked on , if more serious expect to pay more ,

and if you are me , you put on your ground protection and you open that monitor up and adjust the focus block on the flyback transformer , as CRTs age a bit the focus block needs adjustment , I can also tell you that if you plan on doing it , READ any and all documentation on how to adjust a focus block before you do it , and wear ground protection ( or if you're not scared to die like me , just use your plastic screw driver on the focus block and adjust the little dumpling. it's not rocket science in this particular situation just a focus block adjustment , and if that fails , it's time to chunk it , because more than likely it's about to totaly fail.. and easyer to buy a new one..

focus fuzzyness is a sign of bad things ahead ( 50% of the time. )

Again , if a simple focus block adjustment doesn't do the trick , I'd just chunk it and get another one
unless you're a hardware monkey like me who went to electronics school ...

And above all wear ground protection ...

I'm not responsible for accidental injury or death from following my advice on this , just trying to save your monitor.

as for a solve on this , it's a matter of your willingness to adjust the focus block which is on the flyback transformer , scary and dangerous not recommended for those who haven't made their peace with Elohim and are clumbsy lol

I hope this still gets counted as a solve

shalom >:D<

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