Re: Dying IIGS Monitor ?!?

[spector@vax2.concordia.ca (Mitchell Spector)]

In article irsman@iastate.edu (Ian Schmidt) writes...
>
>In article <1JUL199409491615@vax2.concordia.ca> spector@vax2.concordia.ca (Mitchell Spector) writes:
> 
>>(like it's going to lose the picture) when I move the brightness knob towards
>>the center? Just where you feel it lock in at the center, moving the knob will
>>cause the screen to flicker like there's a loose connection or something. I'm
>>wondering what the problem is, and if there's a safe way to fix it...
> 
>Sounds like a dirty pot; try turning the monitor off then moving the knob
>quickly back and forth between the ends of its range to get some of the dirt
>and grime worked loose.  This is pretty normal as things age; my TV's volume
>knob has similar problems.

	Seems you were right, the problem is now gone! I had a simular problem
with an old 'Apple Monitor II' screen, where playing with the brightness knob
(as you describe above) cleared away a kind of snow which appeared each time
it was adjusted. My AppleColor RGB looked as though it might "die" if I
started playing with the brightness-control, but I guess I was wrong.. :)

	The only other problem with this screen is cosmetic. The casing is
somewhat discolored because it was exposed directly to sun light for a number 
of years before I owned it. However, I do have a newer screen manufactured
in 1990 with a nice case (but low quality picture-tube). Would it be possible
to transplant the CRT from the 1987 monitor into the 1990 monitor? Are the
components inside compatible...?

>The brightness sounds like maybe a high-voltage misadjustment.  The red blur
>and odd tint are classic symptoms of the monitor's having been exposed to a
>strong magnetic field to the point where it's internal deguassing coil can't
>cope.  A TV repairman should be able to degauss it for you fairly quickly with
>minimal cost.

	So neither problem is connected to the internal brightness, focus
or tint controls inside? I may take it in for repairs with my fourth RGB
screen. It's previous owner dropped it and it stop working. If I plug it in
(the fourth screen) the power lught comes on for a brief moment and remains
off afterwards. The display is completely blank of course, like the flyback
transformer is disconnected or dead. Any ideas what's wrong with this screen?
(I should probably take the whole lot of them in for repairs! ;-)

>Ian Schmidt / irsman@iastate.edu / irsman@cs.iastate.edu
>"The look in your eyes as you head for the door is a cold fire" - Neil Peart

Mitchell Spector
sb_spec@pavo.concordia.ca / spector@vax2.concordia.ca