SE/30 Logic Board and Analog Board Recapped, Boot Chime Quickly Followed By Death Chime, Nothing Shows On Screen

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BespokeMan

New Tinkerer
May 21, 2024
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I got my SE/30 two years ago and I've been working on and off it since then. When I got this unit it would boot chime to the missing floppy icon. The battery wasn't bombed but there was some leaking cap juice which I've cleaned up. I recently recapped the logic and analog boards. I've left the PSU board alone for now.

I turned on the switch at the back and it does a boot chime quickly followed by a death chime which is the first time I've heard/read of it happening. I've attached a video so you can hear the sounds it makes. Nothing shows on the screen as well. What do you think is wrong and where should I begin diagnosing?
 

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BespokeMan

New Tinkerer
May 21, 2024
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Turns out the brightness was turned down. When I turned it up I got this Simasimac pattern. If the Dead Mac Scrolls is to be followed the problem is the ROM?
 

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ComputerCompulsive

ComputerCompulsive

Tinkerer
Nov 27, 2022
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BespokeMan

New Tinkerer
May 21, 2024
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So I tried swapping out RAM sticks and only testing four SIMMs at a time but it didn't work. I also submerged the board in vinegar, washed it soap and distilled water, submerged again in IPA then air dried plus compressed air but still no dice.
 
ComputerCompulsive

ComputerCompulsive

Tinkerer
Nov 27, 2022
95
46
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BespokeMan said:
So I tried swapping out RAM sticks and only testing four SIMMs at a time but it didn't work. I also submerged the board in vinegar, washed it soap and distilled water, submerged again in IPA then air dried plus compressed air but still no dice.
Click to expand...
Do you have a multimeter? Have you gone through the matrix I linked to check the data lines and address lines for the video?
 
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