"You always start with the mech. focus, because if your geometry/convergence is
perfect and you have to redo your mech focus on any of the 3 guns, the g/c will be off on
that gun afterwards.
You always do your geometry before your convergence, because some TVs have the green
carry any geometry adj.'s with it. Some don't, and the green is independent of everything
else. Since green is your template, it is important to set your template up first, then
converge the red and blue to the green, each.
The precision blue electronic defocusing affects the grayscale, which should be done
last. Electronic blue focus should be tightened up as much as possible for use during the
convergence ops, then defocused very finely when doing the grayscale ops. You need to know
how much electronic blue to defocus before you will know how much blue drive you actually
will need to get D6500K. Since electronic blue defocussing mimics blue drive, that all has
to be factored in together during grayscale setup.
Then you have to go back and retrim the blue convergence, in case it made any of the
convergence go off by defocusing it electronically. Electronic blue defocusing can trigger
astigmatism errors in the blue CRT, making perhaps one side go off more in one direction
Tip from Tom Herman:
Normally the sequence for a full blown calibration is (or at least what I did)
"Following a warm up period of 1 hour, set the TV to the
"Warm/theater" mode and begin setting up the image using the Video
Essentials/AVIA disc. Doing the brightness, then contrast, then colour, then tint, then
sharpness. You've established your first baseline. This is as good as it gets via the user
Now take a reading with the colour analyzer of the grayscale from 20 ire
through 100 ire to chart out the precalibration grayscale tracking. Writing down all the
numbers of course so that you can graph them later.
Enter the service mode of the TV and begin centering the image and
reducing the overscan on all sides. Overscan is typically more than 5% from the factory. I
like to shoot for something in the order of 1 to 2% where possible. On a RPTV, this will
mess up your convergence a bit.
Time to see about removing the protective screen. You can do this
pretty much at any time or not at all.
Do electronic focus next. Take off the front panel and access the 3
focus knobs / trimpots. You can either do the focus by turning each individual crt on or
you can leave then all on and purposely misconverge the three colours so you can see each
one distinctly. Now tighten the focus for the R/G/B. I've done the focus both ways and I
think they are pretty much the same, although some would argue otherwise. There might be a
theoretical advantage to doing the focus with all three crt's on at the same time. You
want to get each of the guns to be as sharp as possible. The Red will be the tightest ...
then the green, then the blue. Often, it will seem like the blue just doesn't want to
focus very well, but resist the temptation to defocus the red and green to match the
thickness of the blue. You will regret this if you do.
Do the mechanical focus now. If the individual CRT's
have wingnuts, unscrew them and physically start turning the lens on each CRT. This is
best done from the back of the set with someone in front giving directions. You will have
to take the back panel off to do this though. Careful.
Convergence. Now tackle the convergence of the three CRT's via the
service menu convergence adjustments.
Geometry.Use the various adjustment parameters to try
and fix any geometry problems. Typical parameters to use are PARA - parabolic, TRAP-
Trapezoid, VLIN - Vertical Linearity. A more extensive geometry adjustment will involve
the use of convergence overlays or the string/ruler method. If you go this route, shut off
the three crt's and then bring up the red first ... align. Then shut off the red. Bring up
the green next ... align ... shut off. Bring up the Blue last ... align ... shut
off. Bring up green ... and red ... align the red to the green. Shut off red.
Bring up the green and blue ... align the blue to the green. shut off blue. Bring up
all three crts and do any final tweaks to the alignment. Your set is now converged and
Grayscale adjustments. Now it is time to set the proper grayscale with
the colour analyzer. When completed, take a post calibration reading from 20 ire to 100
Go back to the VE/AVIA discs and do the
brightness/contrast/colour/tint again setting up these in the service menu as your default
Take another grayscale reading from 20 ire to 100 ire and make further
small adjustments if needed. You may go back and forth a bit more here.
Disable SVM where possible and applicable.
Other tweaks ... include cleaning the mirror inside the TV. Cleaning the
That's it. This is pretty much the entire process that I have taken for my sets and
those I have calibrated.
Some steps can be skipped at your discretion though. Each step when implemented gives
you an incremental improvement in the image you see. Some steps give more of an
improvement than others.
For me, the top three things are: Grayscale, Focus and convergence."