Re: Dying IIGS Monitor ?!?

[irsman@iastate.edu (Ian Schmidt)]

In article <4JUL199409444024@vax2.concordia.ca> spector@vax2.concordia.ca (Mitchell Spector) writes:
>In article irsman@iastate.edu (Ian Schmidt) writes...

>	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...?

I would think so, but without seeing the monitors in question there's no way
to tell.  If they were indeed compatible, CRT transplantation would still be
fairly tricky and potentially quite dangerous, and there's no guarantee you
wouldn't knock the yoke out of whack and end up with two monitors with an
awful picture :)  

>>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

>	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

The brightness problem could very well be a misadjusted screen drive control.
If not that, then we're talking probably nasty repairs to the high voltage
power supply (nasty in terms of the voltages involved :)

>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! ;-)

If it does that consistantly (ie, each time you plug it in it does that) than
chances are it had the flyback solder joint problem and dropping it made it
lose connection entirely.  Check and see if you can see the CRT filaments
glowing after the LED goes out; if so that's probably it.



-- 
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