Question about ViewSonic G800 20" CRT Monitor

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Horizontal widh shrinked

After changed the resolution from 800*600 to 1024*768 Horizontal scanning failed. All picture concetrated in the thin (about 8mm) column in the center of the screen. osd controls working only horizontal width not.
Changed back the resolution bat the same problem.


Help me pls.

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  • Deak Imre Feb 23, 2008

    Cheked and changed the Q303 (2sc4290) strartup ok bat after 5 seconds started to shrink again ,after power down and wait 5 min started up ok dat the same problem after 5 sec


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  • Master
  • 981 Answers

Huh, it sounds like the monitor's horizontal deflection amp (a big transistor) failed. It is not so if you can feed it a good signal and get a wider picture.
You would replace that thing with a transistor with a similar drive profile (i.e. not a FET), if you practice the right safety; better to use a service tech to do it unless you were trained in it. Alternately, you can try freezing your monitor (wrap it to keep out condensation! I only mention this because it's freezing out, where I am....) and see if this helps the transistor recover; it's not that sage or safe though, because of the condensation/electricity hazard and unlikely event that you will ground a work bench surface to do this test!

Be safe and consider using lower-power-consumption flat screens in warm weather.

Posted on Feb 23, 2008

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