CRT Contrast Problem

  • Thread starter David Ellingsworth
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David Ellingsworth

Guest
I have an NEC monitor here that displays the On Screen Display (OSD)
brightly, but the image generated from the out put of the video card to the
monitor is very dark. I tried adjusting the brightness and contrast settings
using the OSD but I can't seem to get the picture to be clear and crisp. The
current image looks as if the entire screen is covered by fog and the image
is still very dark. I'm sure its more likely a problem with an internal
component of the monitor but I'm not sure which component is at fault. The
interesting thing about this problem is that it only effects the incoming
signals from the video card to the monitor and not the OSD. I therefore
think that there is a problem with the treatment of these signals but do not
know how to correct the problem. Any information on what might be causing
what I'm experiencing and how to correct the problem would be greatly
appreciated.

Regards,

David Ellingsworth
 
You did not indicate the model number!

In these types of monitors, this is usually an indication of a weak CRT.
The tech would take readings of the power supply output voltages, and the
bias voltages to the CRT. He would also check to see if the HV is in specs,
and that the scan circuits are working correctly. From this information, an
evaluation can be made to know exactly what the faults are.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
=========================================


"David Ellingsworth" <repair@identd.dyndns.org> wrote in message
news:vskfb.18274$f11.13284@newsread1.news.atl.earthlink.net...
I have an NEC monitor here that displays the On Screen Display (OSD)
brightly, but the image generated from the out put of the video card to the
monitor is very dark. I tried adjusting the brightness and contrast settings
using the OSD but I can't seem to get the picture to be clear and crisp. The
current image looks as if the entire screen is covered by fog and the image
is still very dark. I'm sure its more likely a problem with an internal
component of the monitor but I'm not sure which component is at fault. The
interesting thing about this problem is that it only effects the incoming
signals from the video card to the monitor and not the OSD. I therefore
think that there is a problem with the treatment of these signals but do not
know how to correct the problem. Any information on what might be causing
what I'm experiencing and how to correct the problem would be greatly
appreciated.

Regards,

David Ellingsworth
 
Model # ?


--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)
jstielau@snet.net
==========================
"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd


"David Ellingsworth" <repair@identd.dyndns.org> wrote in message
news:vskfb.18274$f11.13284@newsread1.news.atl.earthlink.net...
I have an NEC monitor here that displays the On Screen Display (OSD)
brightly, but the image generated from the out put of the video card to
the
monitor is very dark. I tried adjusting the brightness and contrast
settings
using the OSD but I can't seem to get the picture to be clear and crisp.
The
current image looks as if the entire screen is covered by fog and the
image
is still very dark. I'm sure its more likely a problem with an internal
component of the monitor but I'm not sure which component is at fault. The
interesting thing about this problem is that it only effects the incoming
signals from the video card to the monitor and not the OSD. I therefore
think that there is a problem with the treatment of these signals but do
not
know how to correct the problem. Any information on what might be causing
what I'm experiencing and how to correct the problem would be greatly
appreciated.

Regards,

David Ellingsworth
Click to expand...
 
The montor is an Acusync 50 with the model number listed as N503 on one
sticker and AS50 on another another sticker.

Regards,

David Ellingsworth

"David Ellingsworth" <repair@identd.dyndns.org> wrote in message
news:vskfb.18274$f11.13284@newsread1.news.atl.earthlink.net...
I have an NEC monitor here that displays the On Screen Display (OSD)
brightly, but the image generated from the out put of the video card to
the
monitor is very dark. I tried adjusting the brightness and contrast
settings
using the OSD but I can't seem to get the picture to be clear and crisp.
The
current image looks as if the entire screen is covered by fog and the
image
is still very dark. I'm sure its more likely a problem with an internal
component of the monitor but I'm not sure which component is at fault. The
interesting thing about this problem is that it only effects the incoming
signals from the video card to the monitor and not the OSD. I therefore
think that there is a problem with the treatment of these signals but do
not
know how to correct the problem. Any information on what might be causing
what I'm experiencing and how to correct the problem would be greatly
appreciated.

Regards,

David Ellingsworth
Click to expand...
 
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