Tube Condition (Wear)
What Uneven Tube Wear Looks Like On-Screen
So what does uneven tube wear actually look like up on screen?
Below are screenshots taken from a projector that had
uneven tube wear.
This projector (a NEC PG) was installed about 12-14" too far back for most of its life. It was then moved to the
correct location to use the entire tube surface (as should have been done in the
first place). The pictures below
are what you would see after the projector was installed at the correct distance.
The result is clear: The image is pretty
much unusable. While the
outside of the image looks good because the tube surface is being used
for the first time, the middle of the image is clearly brown in colour due to
extreme wear from having the projector installed too far back.
All 3 tubes on:
The second picture (below) with the blue tube turned off.
You can see a bit of wear on the green, and the centre of the image is a bit
redder than the outside border:
The last picture (below) shows just the blue tube, and clearly shows the wear
pattern. There is significant wear on this blue tube which is causing most
of the colour balance problems we're seeing in the overall picture. You could
probably just change the blue tube in this case to throw a reasonable picture,
but most people would probably want to change both the blue and green (and
then hopefully install their newly acquired projector in the right spot!)
So you're stuck with 3 options here:
- Use the projector 'as is' and live with it.
(Unacceptable to most).
- Install the projector too far back like the
previous installation and try and balance out the colours somewhat, knowing
full well that the tubes will continue to wear at an accelerated pace.
- Replace the worn tubes and install the projector
the correct distance from the screen.
We'll let the reader decide which is the only acceptable solution. :)
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