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Enric

macrumors newbie
Original poster
Jul 30, 2013
19
2
Geneva, Switzerland
Hi everybody,

Someone gave me a SE 30. It boots fine but the screen displays a black columns exactly every 8 pixels:
se30_deadColumn.jpg

Also, the sound was very weak. There was some capacitors leaks (not too serious). I replaced all capacitors and the sound went back, however, dead columns remains. I tried cleaned the ram modules. The mac comes with 2 set of 4 rams. I tried using only one of the two set in the first memory slot but this did not fix the problem.

I noticed a wire near the center of the board that bridges a chip pin with a another point:
se30_logic_board.jpg

I look around for some SE 30 pictures over the web and did not see such wire on other board.

Any idea is welcome!
 
Last edited:
Swap the SIMMs around. See if the issue moves.
Or the machine crashes. It's supposed to check RAM on startup, I find that doesn't always detect bad RAM.
 
Check around the capacitor circled for etched tracks (they'll look black).

Also check tracks from the 4 74F253s have continuity to somewhere. These are the multiplexers for the video RAM. Broken/etched tracks to these 4 could be the problem, caused when C7 leaked.

It's also possible that one of these tracks goes underneath C7.

The prototyping wire might be a fix not present on all boards OR a factory repair for a bad track.
 

Attachments

  • se30_logic_board Video Address.jpg
    se30_logic_board Video Address.jpg
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Fixed!

Fixed! thanks for advices.

It was quite tricky figuring out where the tracks go underneath the chips. I first identified the good ones, which allowed me to deduce the bad one.

mac se 30 bad track_s.png

Fixed it with with a quite thick wire. I am not a pro at soldering but I improve myself...

mac se 30 logic board fixed_s.JPG

And here it is!

shuffle_puck_s.JPG
 
Fixed! thanks for advices.

It was quite tricky figuring out where the tracks go underneath the chips. I first identified the good ones, which allowed me to deduce the bad one.

Fixed it with with a quite thick wire. I am not a pro at soldering but I improve myself...

And here it is!

View attachment 438877

Pretty good job if you ask me!

Shuffle Puck Cafe! ;)

Well done! :)
 
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