Good eye! Definitely there could be a few traces suspect there. At least they all look fixable on first glance [if they are broken].Can you have a look at those two spots ? Hard to see but look Strange to me.
Try the self test
The self-test is activated by pressing Open-Apple and Option on power up
I tried the self-test and gotTry the self test
The self-test is activated by pressing Open-Apple and Option on power up
There are two separate threads accidentally. I made a typo in the first one and tried to correct it by editing the post, but somehow it created a second duplicate post. (This one were in now) I have tried to delete the other one but couldn’t figure out how to.I'd guess this is more likely a RAM issue than ROM. The computer is doing the right thing at start-up (ROM) but there's a repeating pattern of wrong lines in the screen buffer. Could be bad RAM, or a bad address line?
Also I just noticed there are two separate threads about this same IIgs problem going simultaneously here. From the other thread:
Is that possible to repair? If so where can I find instructions?That screenshot *really* looks like bad Mega II-side RAM. It's possible the code isn't being reported correctly because of that.