Recent content by asphaise

It won't come as a surprise, but @JDW was 100% correct again. The replacement analog board with the non-broken flyback transformer came in the other day. First, I swapped in the whole board, but there was significant jittering at startup and the display was very dim. Checking online, this...

Maybe I'll buy one of the salvage analog boards from eBay and see what happens. I could always resell it to add it back to the available supply. Thanks for the suggestion. I'll let you know when I make the swap.

@JDW Your eagle eye was correct. The bar on the flyback transformer is very broken. No amount of poking or prodding on any of the harnesses, connectors, or the flyback itself could reliably cause any sort of screen reaction. I checked the photos I took of the analog board when I bought it...

Let me make sure I understand. Is the thing in the red box in this image the broken bar on the flyback? If I understood the other threads finding a replacement flyback will be difficult. I'll crack the machine open and trying prodding some of the connectors with a plastic tool to see if...

Unfortunately, my screen is starting to freak out again. I'd say it's sporadic, but more violent than it was before I replaced the BU406 chip. The display image is also creeping to the left side of the display. I've gone through several display threads and saw JDW's recommendation to read...

It has. I retrobrighted it during my rehab a few months back. It had the typical yellowing when I got it.

I reprinted by BlueSCSI tray in the Polar Filament Retro Platinum and the color is a much closer match to my computer's particular shade. This image is the original in PolyTerra Muted White This is the new one in Retro Platinum. Much better match. Thank you so much for taking the...

Thanks for doing this. I just ordered a spool.

This looks very similar to the issue I just dealt with. I suggest you read the whole thread I've linked below. It isn't very long and there is some good information from some very helpful people. In the end, replacing one transistor, BU406, solved the wobbly screen problem I was having. It...

The replacement BU406 transistor has finally arrived and I've made the swap. The change isn't difficult, provided you have some basic level of soldering skills. If you're like me, you'll struggle for quite a while to get the old transistor to desolder and then build up some ugly blobs around...

Well, that's embarrassing. You are 100% correct. Thanks for setting me straight. I'm going to go ahead and order some replacements and hope I can replace it without damaging anything. There are three solder connections and they're the poke-through kind. That and the attachment point to hold...

My curiosity got the best of me and I went looking for the HOT. I don't see a Q3 or a BU4906 on the analog board. I guess that means the Mac Classic is different than the SE/30. The only thing I see on the analog board that bears any similarity to a BU4906 is the item I've circled. If I read...

Thanks for the information. I'll take the computer apart this weekend and make sure I can find the transistor.

Thanks. I've actually replaced the fan with the JDW Noctua swap. It's possible I did a bad job. Maybe I should briefly remove it and see if the screen wobbles at all with it gone.

Thanks for the tip. I'm doing some searching on the internet to try and figure out what a horizontal output transistor is and which is the right one for the SE/30. I found a schematic for the Mac Classic online. The document identifies the HOT as Q3, which shows Q3 as BU406. Digikey tells me...