Hello--I've got a ~ 2 yr old 19" HP monitor, model #P1284A, that
started life out a little fuzzy toward the middle of the screen, and
has gradually gotten really aggravatingly out of focus (there may well
be a better term for this condition, but that's what it seems to
everyone in the family; it's just simply not in focus, esp. toward the
center of the display...). I don't find any "user serviceable"
control front or back that might address such an adjustment. Can
anyone here lead me to some straightforward internal means of tweeking
this? Thanks--Charley Hale, Lafayette CO

In most monitors on the flyback transformer at the HV multiplier there
should be a pot marked focus. Next to this pot there is usually a screen
bias adjustment. You do not want to touch the bias adjustment. You will
find that if the tube is defective, or the multiplier is defective, you will
not be able to have the proper range to adjust it in. Some monitors have an
H and V focus pot. One does the horiz axis of focus, while the other does
the vertical. Normally the focus is peaked at the centre of the screen.

If you are getting good focus at the centre, and unacceptable focus at the
sides, then this would be a defect in the dynamic focus circuits, or HV
multiplier, or CRT itself. To service this, you would have to have the
proper training, set-up, and service manual for your monitor. I can tell
you in advance that if the CRT is defective, your monitor would not be worth
servicing.

If the flyback is bad, this would depend on how much you want to invest in a
monitor that is out of warranty, and is a few years old. You would have to
take it to a place that services computer monitors to have an estimate.

Take care when venturing in to a monitor. You should not use a metal bladed
screw driver to do adjustments in case you slip. You should use a plastic
bladed screwdriver for this. We use all plastic bladed alignment tools for
doing adjustments. If you accidentally touch something, you can either get
hurt, or cause a lot of expensive damage.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
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"CHale" wrote in message
om...
Hello--I've got a ~ 2 yr old 19" HP monitor, model #P1284A, that
started life out a little fuzzy toward the middle of the screen, and
has gradually gotten really aggravatingly out of focus (there may well
be a better term for this condition, but that's what it seems to
everyone in the family; it's just simply not in focus, esp. toward the
center of the display...). I don't find any "user serviceable"
control front or back that might address such an adjustment. Can
anyone here lead me to some straightforward internal means of tweeking
this? Thanks--Charley Hale, Lafayette CO