SE/30 Bright Vertical Edge

[lubert]

After replacing the 7905 and BU406 on the analog board in the hopes of reducing some screen wobble, the display started showing a bright and stable vertical line on the right edge. The Dead Mac Scrolls mention replacing the BU406 would fix a bright (but wiggling) right edge, so I'm wondering if the replacement BU406 was bad as well.

Has anyone seen anything like this before? Appreciate any help!

 

[shirsch]

Try playing with the width coil and horizontal positioning.

 

[bibilit]

Never seen before, but looks like you are having a foldover on the right edge ( round corners are missing)

 

[lubert]

As an update, I replaced the BU406 with a BU406D and that fixed the issue! Thanks folks for the replies.

 

[obsolete]

Thanks for documenting your experience! Glad to hear you got it fixed

 

[Byrd]

As an update, I replaced the BU406 with a BU406D and that fixed the issue! Thanks folks for the replies.

I'm going in to do same with an SE/30 with jumpy/jittery video (all other avenues exhausted), do you think the BU406D you bought was just a better quality version? I've a pack of ?? unknown BU406 and reckon they might be super cheap.

 

[lubert]

I suspect the key difference is BU406 vs BU406D. There’s a thread here that describes how BU406 seem to measure differently: https://forum.vcfed.org/index.php?t...-logic-board-is-there-a-chance.1249210/page-4