>Like the subject says. Even when the brightness and contrast are
>cranked all the way up the screen is still too dim to be usable, even in
>The monitor in question is an Apple multiple scan 20, actually a Sony
>tube. It was made in May 94 so it is relatively recent. It is newer
>than my old Sony 20 inch made in 1991 which is still very bright, plus
>other old Sonys we have from 89,90, and 91 or so which are fine. This
>leads me to believe that the tube itself should still be in good
>condition and the problem is elsewhere.
>Any tips? I have opened it up and there are few usable controls in
>there. There also appears to be nothing obviously wrong with any of the
>internal electronics, but I can't be completely certain about that.
>The monitor was given to me in this condition, I don't know the story
>behind it and can't give any other info. Is this a common problem?
>What should I do? What could I expect to pay if I took it to an Apple
>place to have it either fixed or replaced? Any other recommendations?
>Thanks for the help
Your problem isn't common. I've not seen many bad CRT's on these monitors,
but those I have mainly suffered from poor focus. A few were a little dim,
but you could obviously see they had been heavily used by the desktop burnt
into the screen phosphor.
These monitors are unlike others that have a screen or G2 control internally
that can be used to peak up the brightness of a failing CRT. The M1823
Multiple Scan 20 is based upon Sony's GDM-20E01 and uses DAS software for
many of its adjustments. This was the last monitor that Sony made that also
had a service mode for the same adjustments. Using this mode is fiddly, and
can easily result in screwing up other adjustments if you make an error.
Email me if you want to risk this. Depending upon the value you put on the
monitor, it may be better to have it repaired professionally. Here you have
2 options, module exchange via an AASP, or an independent component level
repairer. The repair via an AASP will be expensive, and although a component
level repair will be cheaper, you may have trouble finding someone with the
right level of experience to do the repair.