Question about NEC MultiSync 77F 17 in.CRT Conventional Monitor

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NEC 77F CRT monitor - displays alternating black \ white crosses

When the monitor is powered on, it shows two perpendicular white lines that intersect the center of the screen on a black background. After 2 - 3 seconds, it shows black lines on a white background. It alternates from one to the other continuously, and I can't get it to do anything else (OSD controls make no difference.) NEC has a monitor troubleshooting guide, but I haven't been able to access it. I'm hoping the CRT is still good and that I can keep the monitor out of the landfill - what do you think's wrong with it?

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  • Ted Hamiter Jul 20, 2007

    I didn't think any of the buttons were stuck, but I pushed all of the buttons on and off (with the monitor turned off), and I connected the monitor to a dual-monitor setup. I was thinking that maybe I could get the monitor unstuck if I could change the resolution (or something like that.)

    The monitor worked perfectly as soon as it was powered on, so maybe it was one of the buttons. Thanks for the suggestion AKAShadow, it seems to have worked.

  • Anonymous Apr 08, 2009

    I have 2 pendicular lines intersect middle of my screen and it does make a beeping noise

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Sounds like its stuck in test mode. Make sure that none of the buttons are stuck in place and does it make any noise while its turned on?

Posted on Jul 19, 2007

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What is the meaning of perpendicular lines


Parallel lines are lines that go on forever and never cross. In mathematics terms, they have the same slope, but different y-intercepts. For example, y= 3x + 5 and y=3x +7 are parallel lines.

Perpendicular lines are lines that intersect each other at 90 degrees or at right angles. If y=5 and we are looking for a line that intersects it at 90 degrees (or right angles), the line would be x= 4.

Another example would be y = x. The perpendicular line would be y = -x.

To find the perpendicular line, the slope will be the negative reciprocal. For example, y = 3x + 5, the line perpendicular would be y = - 1/3 x + b.

Another way of looking at this is if you take the slopes of the two line and multiply them, you should get -1.

Let me know if you have any questions.

Good luck.

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