Macintosh 128k Help

[MacAttack]

So, I posted here about a year ago about a 128k Macintosh that I got off of craigslist. Since then I figured out that the ram was bad and replaced it. I've got to a point where the computer functions but the video has a major issue. I have been unable to find the issue so far, so here I am again! For further reference, I do have logic probes and an oscilloscope at hand if that helps fix the issue.

(Before Ram Replace)

View attachment 21922

(After Ram Fix)

 

[Dog Cow]

Where is your arrow pointer? When you move it around the screen, does it also show up more than once? Do you have two arrow pointers moving simultaneously?

 

[MacAttack]

Yea, Everything appears to be mirrored three times, one on the right, one in the middle and one on the left.

 

[MacAttack]

Here, I photoshopped about where the mirrors are occurring.

 

[tattar8]

Could this be caused by a bad mux or demux (assuming the 128K has anything like that) causing the same data to be stored multiple times to the framebuffer?

 

[MacAttack]

Probably not, I already replaced the MUX chips with brand new Motorola chips but this next chance I get I'll test them with my logic probe to see if I scorched the chips while soldering.