Dead SE/30 question

[MikeatOSX]

Hi, 

I got a dead SE/30:

no boing but short rustle from the speaker, black screen, no sound from floppy, SCSI2SD board blinks once, when the Mac is switched on. That's all. 

I've read "The dead Mac scrolls" and more and these books told me about a bad analog board when getting a black screen. More failures may come, when I get a working screen...

So I bought a (working ! ?) analog board / power supply from ebay and replaced the old board and power supply. 

Same problem now.

Could this failure be on the video board or logic board as well?

Hope you can help me.

Thanks!

 

[Bolle]

Did you recap the logicboard yet?

If not this has to be done before any other troubleshooting can take place.

 

[MrGasS27]

You should see if the motherboard is corroded by battery or capacitors, and you also have to recap it

 

[BadGoldEagle]

A bad logic board can produce no video even with a good A/B... As others said, if not recapped, recap that thing first. If you have a spare board from another SE/30 or even an SE, you could try and swap logic boards just to make sure the A/B is fine.

 

[MikeatOSX]

Thanks, yes I have a spare SE board, which I can try. If this works I know what I have to do.

 

[MikeatOSX]

If you have a spare board from another SE/30 or even an SE, you could try and swap logic boards just to make sure the A/B is fine.

Great!

I tried the logic board of my working SE and after the bong I got a horizontal white line. When I press on the left topside I get a blurred message, telling me to register ConflictCatcher. The screen collapses after a while until I press again.

It seems the ebay seller sent me an analog board ("tested working") with cracked solder joints.  :/

 

[MikeatOSX]

Now I did it [SIZE=12pt]vice versa.[/SIZE]

[SIZE=12pt]I tried the SE/30 logic board in the known good SE. [/SIZE]

No bong, black screen, fan is working, SCSI2SD seem to start. 

That's all. 

So the SE/30 logic board is buggy, I suppose.

UE8 ?

 

[BadGoldEagle]

That's a start...

If I were you, I'd try to get my money (partially) back. Can you try another neck board? Perhaps the one from your working SE? I've heard the weird cut-off thing you're experiencing can be caused by a failed component on that tiny little board. 

Again, was the board washed and recapped? Cap goo could be causing a short circuit somewhere.

 

[MikeatOSX]

I resoldered the 4 pins of the P1 connector and got a steady screen now (with the SE logic board in the SE/30). 

Yes, a neck (video) board (and a second analog board) is still in the customs office here, I get it from Canada. 

No, the board is not yet cleaned, as I got it yesterday and I wanted to see if it

is working. 

I'm not satisfied with the screen after recalibrating it: still a bit blurry, can't dim it, as the adjusting knob below the screen does not work. Also I cannot adjust the width.

The SE analog and video board are much better. Maybe I'll swap them. 

 

[Bolle]

So the SE/30 logic board is buggy, I suppose.

UE8 ?

First changing caps and cleaning and then UE8 and its neighbours.

 

[MikeatOSX]

So I have to bite the bullet in my spare time.

Some other Macs (68k PowerBooks) are also waiting for a long time. Got the fourth SCSI2SD PB Edition today...

p

 

[MikeatOSX]

If I were you, I'd try to get my money (partially) back.

This seller is able to remove negative feedbacks as I found out, so he always gets 100% positive although selling scrap:

sold item

I'll try the second bought analog board when I get it from the customs office and then I'll decide which one of these 3 boards I'll try to repair.

The original analog board was rev C but not in a good shape, the others are rev B and rev A. 

Today it's board washing time...

 

[MikeatOSX]

After that all I had an idea and so I cleaned the original analog board of my SE/30 (rev. C), installed a new Noctua fan and put everything back together including the SE logic board. And what should I say: I got a beautiful clear screen from the beginning, just like new! 

Everything is working fine: screen, analog board, power supply, video board, floppy drive and SCSI2SD, except the SE/30 logic board which is definitly damaged although it looks like new after cleaning.

And I, as an idiot as I am, bought 2 used analog boards (rev. A and B)  from fleabay.  :wacko:

Recapped SE/30 logic boards are very hard to find, as far as I know.  :sad:

 

[TjLaZer]

Very common issue on the SE/30.  Recap the board.  If you are lucky everything will work.  I have 3 SE/30's.  1 was dead like yours, 1 worked with no sound and the 3rd was working.  I recapped all 3 and got two to work 100% and the one with no sound stil has no sound.  All had lots of leakage and smelled of fish when I removed the caps!  Looks like corroded traces around the sound chip from those leaked caps which is very common.

 

[MikeatOSX]

Looks like corroded traces around the sound chip from those leaked caps which is very common.

After washing the logic board the speaker produces loud noise now, some sort of screeching as if I would feed the speaker with DC.
And still black screen...

 

[MikeatOSX]

Last question:

the fuses F1, F2, F3 on the logic board - which special malfunctions are caused by them if they are dead?

Black screen too?

 

[BadGoldEagle]

Again, recap the board first or have it recapped by someone else (some members here offer a recap service or use maccaps.com). That's the first thing you should do before fiddling with anything else on an SE/30 board. You could be right, fuses could be the culprit but a recap usually fixes most issues as illustrated by TjLaZer here. Bad caps and shorts are the #1 cause of malfunction. 

Other than that, congrats on your A/B job. Gotta love the Noctua. Personally, I would have gone with one from their "pro" series because they're grey instead of cream/brown. But good choice nevertheless. 

 

[MikeatOSX]

Thanks, I also put another Noctua in my SE.  B)

 

[Bolle]

If you’re not up to recapping it yourself you can send it to me if you want. We’re practically neighbours, no need to send it off over the pond to maccaps.