[vcf-midatlantic] Apple IIgs Black Screen

[Sentrytv]

The Apple2 GS uses a specific monitor
And is not compatible with a Mac monitor!

I can’t remember if the signals are digital or analog but I assume they are digital and it might be considered RGBI 15 kHz
I’M SURE THERE ARE MORE PEOPLE HERE WHO HAVE THESE EXACT SPECS
Mike

Sent from:
My extremely complicated, hand held electronic device.

> On Apr 19, 2024, at 9:39 AM, James via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org> wrote:
> 
> Oh I see. The second RGB monitor I tried was from a Performa 6400. The
> monitor works with the Performa, but perhaps connected to the IIgs it does
> not get the right signals.
> 
> I guess this means that the problem can either be with the IIgs RGB out or
> the IIgs monitor itself. The symptom is a pitch black screen. When I turn
> the monitor on I hear a click like it is turned on and the light goes
> green, however, I don't see ANY visible sign of brightness even when I play
> with the brightness contrast controls. I also don't hear a CRT-like sound
> you hear when you press a degauss button or like the TV makes when I turn
> it on. Perhaps this means the issue is with the monitor afterall?
> 
> I can bring this setup to the repair workshop May 4 or 5 if there is anyone
> who can help me troubleshoot the issue. Opening up a monitor (and/or PSU)
> is beyond my skill set and not something I feel comfortable doing myself.
> 
> 
> 
>> On Fri, Apr 19, 2024 at 9:29 AM David Ryskalczyk <d235j.1 at gmail.com> wrote:
>> 
>> Which specific Apple monitors are you using? Later monitors meant for the
>> Mac will not work with the Apple IIgs as they cannot sync at 15khz.
>> 
>> David
>> 
>>> On Apr 19, 2024, at 9:21 AM, James via vcf-midatlantic <
>> vcf-midatlantic at lists.vcfed.org> wrote:
>>> 
>>> Henry, you were correct! I attached a composite monitor and now see a
>>> beautiful animation telling me I don't have a startup disk.
>>> 
>>> Is the onboard RGB repairable or am I looking at a custom chip that is
>> hard
>>> to come by?  I would hate to have to use a TV and not my Apple monitor.
>> The
>>> TV would ruin the whole aesthetic of the IIgs to be honest.
>>> 
>>>> On Thu, Apr 18, 2024 at 11:29 PM James <tenprintclearhome at gmail.com>
>> wrote:
>>>> 
>>>> Hi, I have an Apple IIgs and when I boot it I hear a beep shortly
>> followed
>>>> by another beep. The screen remains black. I've tried a second known
>>>> working Apple monitor to the same result.
>>>> 
>>>> I've tried it with both floppy drives attached and not attached. I don't
>>>> have any disks but was assuming I would at least see a complaint on the
>>>> screen about missing startup disk. I don't see anything.
>>>> 
>>>> Does anyone know what my issue is or can you recommend a good Apple II
>>>> troubleshooting site? Working on Apples isn't something I have much
>>>> experience with.
>>>> 
>>>> 
>>