IIgs Monitor Repair

[Polymorph <polymorph69@hotmail.com>]

Hi All,

I have a couple of questions relating to repairing a monitor for my
daughters IIgs.

For well over a year now, I have had an old Amiga monitor hooked up to
the IIgs via a SCART adapter (courtesy of VintageWare). Unfortunately,
2 days before Christmas something in the monitor died. It was working
fine, then all of a sudden the picture went out and it started making
a loud whirring/whining sound (almost like something rotating). I
thought it might have been the electrolytic capacitors in the power
supply, so I replaced them all; but the situation did not improve.
However, I now believe the noise to possibly be coming from the "fly-
back" transformer. Does this sound likely? If it is, is it worth
repairing as I could not find any details regarding the make/model of
this transformer. Also, I could not find a schematic for the monitor.
I am thinking this might now be a dead-issue, but wanted some experts
opinions before giving up on it.

Also, I have a standard AppleColor RGB (IIgs) monitor that I have now
replaced the above dead Amiga monitor with, however it has issues of
its own (which is why I was using the Amiga monitor in the 1st place).
This monitor starts off clear and sharp but with low contrast/
brightness; so you need to have both turned up high to get a good
picture. The picture gradually gets brighter and brighter and the
image quality deteriorates and loses focus (gets very blurry and hard
to read). After about 30 minutes, the contrast brightness is very high
and the image is very blurry (almost to the point of hurting your
eyes).

Now this problem sounds very much like the problem mentioned in Q.34
of the Apple II Monitors FAQ which I will now quote the question and
answer:

"034- I picked up a IIgs RGB monitor at a garage sale. The focus is
     off and it took several minutes until the display got brighter
     but it's still not very good. Are there any adjustments that can
     be made?

     The problem you describe is consistant with low B+ going to the
flyback
transformer which results in low brightness level, poor focus, and
blooming
when the brightness and/or screen level is turned up. More than likely
if this
monitor has been sitting around for awhile, the filter capacitors have
gone to
mush. Sometimes they can be revived by leaving the monitor on for a
long period
of time <over 24hrs> but, usually, they require replacement. "

Now, as this sounds *very* similar to the problem I'm seeing, I'd like
to try and replace the main filter capacitors as described in the
answer. The question I have though is - which are the "filter
capacitors" in the monitor? I cracked the case open the other day, and
there is one big 450V cap near the power supply. Is this the one being
referred to, or is it somewhere else?

Any help would be much appreciated as I'd like to get my daughters
IIgs running perfectly again. Either that or I'll be on the lookout
for a replacement monitor.

thanks,
Mike