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Thanks again @JDW. I tried all of the above with no luck but then I removed and reattached the anode cap which did the trick after adjusting it a bit. Of course I discharged the CRT before doing any of this.  From what I can tell the machine was used for bookkeeping in Mount Isa Queensland at...

So I got the board recapped by a pro who tested it and said there were no issues. However once I got it back and plugged it in the flicking issues were still there (see video).  I'm assuming this is an issue with the CRT or the flyback. Any one got any thoughts?

Thanks! I've decided my recap job was too shoddy so I'm going to get someone else to do it then go from there. 

OK update 8 months later (I moved house, changed jobs, covid) - I've recapped the board and now it's sad chiming with horizontal stripes (same issue that @JDW had nearly 10 years ago - https://www.youtube.com/watch?v=mKJszJMRZM4). From what I can tell the issue is most likely faulty bourns...

You should try and your hands on a scsi-to-ethernet adapter purely to see how far this can go.

Correct me if I'm wrong, but the only proprietary part of the accelerator boards is what's on the ROM chips isn't it? Could you theoretically reverse engineer your own accelerator boards with off the shelf parts and a PCB?

Thanks, I've done a good clean with isopropyl and a scrub with vinegar around where you suggested and It's still occurring. So recap and report back.  Thanks for your input, really appreciate it.   

I'd check the SCSI2SD settings first.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F400922654856 Very expensive though, might be better finding another mac with other problems and cannibalising it for parts.

Finally got my hands on a (some what) affordable SE/30, perfect recapping project for the Christmas break.  The Ebay listing said it's been upgraded to have an ethernet card, 20mb of ram and a 252MB hdd. Got some pretty bad screen flicker, the floppy won't read or eject, no chime and it looks...

I managed to score an SE30 for the same price as the HD20 a few days ago and it's listed as having a 250mb drive. So when it arrives I'll see the condition of the drive and put it in the HD20 if it's all good and put my SCSI2SD in the SE30.  Anyway I'm going to try the oil the MiniScribe to see...

Too late! I was having real trouble with the back fan one so I went around and loosened the others - by the time I got the fan one out I forgot to check the others and the front left one snapped when I was lifting it up. Stupidly careless of me considering I paid too much for this thing. I used...

Thanks @JDW, my 20sc just arrived. You video will be super useful.

I had a similar issue with mine, turned out it was just some of my d-grade soldering and some pins weren't in right. I'd check for continuity first, if that doesn't help maybe contact Steve from BMOW, he's really responsive and helpful.

Weird one, but my newly purchased and yet to be recapped Performa 650 seems to only have a 16 mhz CPU (MC68030FE16B). Did some googling and found @techknight had an LCIII with the same CPU. As far as I can tell it's definitely an LCIII board and not an LCII. Anyone got any thoughts on this...

Haha fair point! I'll try and wire up a new one and see how I go. 

Weirdly enough it was old/new stock labled as a Mac Plus serial adapter. But I'll check with the multimeter if the pins match up. Otherwise I'll fashion a new one. Cheers.

I've been trying to get my Plus to talk to my iMac via Z-term, a serial cable a gender changer and a usb to serial adapter.  But I can't for the life of me get them to talk to each other, I've got matching settings on both, the Belkin adapter's TX signal lights up when I send a string from the...

And you lose display backlight with Windows 10 unless you flash to the Dell firmware.. which in turn doesn't work with MacOs. The DHCP tables don't match up (I believe because Apple doesn't use lvds like most laptops). I tried a 780m for a few weeks but as I still had a working 6750M that I...

Great machine, I got one for $100 and I've added an ssd and 20gb of ram. Only problem is that the gpu's are prone to fail, you can replace them with nvidia cards but there's no EFI compatible firmware for them yet, so you don't get boot screen or brightness control.