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SE/30 Screen Artefacts

robin-fo

Well-known member
Hi everbody

After running for some minutes, some serious pixel errors appear on my SE/30‘s internal screen. The logic board is a replica with all-new passives, the AB is not yet recapped. Snooper doesn‘t appear to find any RAM errors but the DIP PALs get quite hot (ca. 50° C). Interestingly, the pixel errors appear to move with windows…

Updates:
- After running for ca. 10 minutes, the pixel errors disappear again ( -> heat has distributed evenly??)
- Appears with stock and Rominator ROM
 

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Last edited:

robin-fo

Well-known member
I was even able to make screenshots of it.. What is going on here?? The ClarisWorks canvas on the third picture mostly stayed normal...

Bild 2.pngPicture 1.pngBild 3.png
 

PacificState

Well-known member
I just built one of the replica boards:

- The PALs do get quite hot normally
- The RAM test doesn't check the video RAM, I think(?)

This kinda looks like a failing bit (or more), but I can't understand why some stuff is drawing correctly.

Ideas:

- Look at the schematic and recheck the soldering around the video logic
- Assuming you socketed the video RAM, you could try grabbing some NOS parts and swapping them in

Caveat emptor: there are people on here with more experience than me who could have seen this before and have a better idea ;-)
 

Bolle

Well-known member
Try some faster VRAM. For some reason I had similar issues on one board I built. Not exactly sure what causes it, but faster VRAM fixed it.

Also PALs getting really hot is perfectly normal.
 

robin-fo

Well-known member
Try some faster VRAM. For some reason I had similar issues on one board I built. Not exactly sure what causes it, but faster VRAM fixed it.

Also PALs getting really hot is perfectly normal.
Thanks @Bolle; du you have a suggestion which model number I could try and where to look for it?
 
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