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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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CRT Contrast Problem
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 |
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#2
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CRT Contrast Problem
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" wrote in message hlink.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 |
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#3
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CRT Contrast Problem
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" wrote in message hlink.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 |
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#5
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CRT Contrast Problem
Model # ?
-- ========================== Jeff Stielau Shoreline Electronics Repair 344 East Main Street Clinton,CT 06413 860-399-1861 860-664-3535 (fax) ========================== "If you push something hard enough it will fall over." Fudd's First Law of Opposition - Sir Sidney Fudd "David Ellingsworth" wrote in message hlink.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 |
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#6
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CRT Contrast Problem
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" wrote in message hlink.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 |
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#7
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CRT Contrast Problem
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" wrote in message hlink.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 |
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