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From: Andrew Roughan <no_email@invalid.invalid>
Newsgroups: comp.sys.apple2
Subject: Re: Magic smoke!
Date: Mon, 24 Feb 2025 12:33:46 -0000 (UTC)
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phigan <wwiv@bbs.penisys.online> wrote:
>
> The other unit that I would like to get working is a IIgs. Right now
> when powered on it only shows thick horizontal black and white bars on
> the screen. I'm thinking it's most likely some of the onboard RAM that
> is the culprit (ROM3), but there may also be a sign of a leaked cap or
> two in that one as well.

Did you mean vertical columns of white and black?
This is usually a sign that the CPU has not kicked in. Has this machine had
an accelerator in the past? Perhaps the cpu socket is not making good
contact with the cpu. 
I have not heard of many people having issues with the IIgs capacitors.
They are not surface mounted and therefore avoided the bad caps plague.
Regards
Andrew