SE/30 Is This Simasimac Problem?

[Adam_NZ]

Hi there, I am new to Mac vintage world and about 6 month I bought SE30 with problem.
It would boot up to OS but as soon as I would start moving mouse, screen would be turning into garbage. After few days screen would look as per attached photo and from memory I can not remember if it would give sound when booted into OS.
Today I opened it and re capped it but problem is still the same. Board looks like in excellent condition with no battery leak nor visible caps leaks.
Thing is, I am not sure if this is Simasimac problem or something else? I did some research but my problem and screen I get is different from other macs with Simasimac problem I could find online.
I forgot to mention, floppy icon with flashing "?" is still visible as well as mouse pointer when I move mouse across the screen.
Does anyone have any idea if this is Simasimac problem or something else and how should I approach it?
Many thanks
Adam

 

[cheesestraws]

No: simasimac tends to refer to a situation where the computer isn't booting. This is booting.

I'd be inclined to look at either the VRAM or the write path to the VRAM.

 

[imactheknife]

Would recommending washing board in isopropyl 99%. Light scrubbing with soft toothbrush etc. fully submerged. Let dry. Even though board “looked clean” can guarantee it isnt.. speaking from experience!

 

[Adam_NZ]

No: simasimac tends to refer to a situation where the computer isn't booting. This is booting.

I'd be inclined to look at either the VRAM or the write path to the VRAM.

Thank you. VRAM is is 6 ICs marked Ux8. Would that be correct?

 

[Adam_NZ]

Would recommending washing board in isopropyl 99%. Light scrubbing with soft toothbrush etc. fully submerged. Let dry. Even though board “looked clean” can guarantee it isnt.. speaking from experience!

Thank you. I did not submerged, but I gave good scrub with toothbrush and liberal amount of alcohol, than electronic cleaning solvent and than with alcohol again