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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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.
Sounds like the screen is going bad. Isolate the problem by plugging an
external monitor to the laptop. Borrow a monitor from a neighbor,
friend, relative or co-worker to plug to the laptop. It can be
any kind of monitor even the
old big fat
crt monitors as long as it has a vga cable to connect to your computer's
port. If the Borrowed monitor does not show the black lines and snowy
background, that proves your video card is ok and the problem is
your lcd screen. If the borrowed monitor shows the same black lines ans
snowy background it means your video card inside the
computer has the issue.
The video will show
on most systems when you reboot without you having to do anything. Some systems
will require you to hit the FN (Function key) + F1 thru F12. Hold down
the FN key then hit the correct key for displaying on the monitor (F1 thru
F12). The correct key will normally have CRT/LCD on it or it will have
the icon of a display.
Try changing the coolant in the blue tube. Contaminated coolant will give a halo look to the affected tube and you will experience difficulty focusing that color.Phillips/magnavox's blue is the tube most often affected with the contaminated coolant issues.