003, please don't feel stressed out over my post above. I wasn't bashing you in any way, nor was I demanding an SE/30 logic board. I only mentioned that point because you had suggested the same thing to me in threads past; namely, that I should test with "another SE/30 logic board." But again, I cannot test that because I don't have another "working" board.
With that said, I will enlighten you on two points:
1) The working SE/30 board I have now exhibits those
strange artifacts (same as shown in that photo, and not a pixel different, mind you) regardless of ROM (as I just stated above in my previous post, in addition to other threads).
2) I have another SE/30 logic board that no longer works. It did work at one time and was my primary working board. I then found an SE/30 logic board on EBAY a year ago and thought it best to have a backup in case anything happened to my primary board. I recapped both boards. I put the new board in my SE/30 and continued to use that because I wanted to make sure my recap job was perfect. But one day I had a little glitch (which I reported in detail on this site before the crash). I then pulled the new board and put back in my old. But for whatever reason, my old, trustworthy logic board no longer worked! I get horizontal lines on startup, with no bong, every single time I try to start up. I've posted in detail with many thousands of words about all I've done to fix the board, but to no avail. Something killed it and its now dead.
Whew. I said all that to give you some history. Now let me add to that by saying that "I NEVER GOT THOSE
STRANGE ARTIFACTS ON MY FIRST SE/30 LOGIC BOARD WITH ANY ROM!" And yes, I had my IIsi and IIfx and multiple SE/30 ROMs at that time (at the time my original SE/30 logic board worked). No problems whatsoever. The only thing that I did see was horizontal lines at cold boot for a few short seconds when the IIfx ROM was used. But I read many, many posts online about people who had the same situation as I did, so I didn't worry. Posts about what? Posts about how using the IIfx ROM will cause horizontal lines (NOT "SimasiMac" mind you!) at cold boot. But it doesn't affect the Mac in any other way at all.
I say this because, so far, I've only seen two of you out there who have seen some OTHER type of artifacts ("other than horizontal lines") when you use a IIfx ROM. The vast majority of experiences I've read parallel my own experience (with my first SE/30 logic board anyway) of generating horizontal lines at cold boot for a few short seconds, but only when a IIfx ROM is used.
The reason I asked
Charlieman to post a photo for us is because I want to examine his problem more in depth. Why? Because I used to be an Apple Service tech for MicroAge Computers in California in the late 1980's, I have nearly all Larry Pina's books, I have an engineering degree, and I have a love for classic Macs that inspires me to WANT TO KNOW "WHY"! Everything I've read and experienced about "checkerboard patterns" on old SE/30 Macs points to either a bad connection at the ROM SIMM connector (dirty pads on the ROM and/or dirty or broken pads at the connector), rather than the actual ROM itself. The other possibility is a couple points on the analog board need resoldering, and I made that clear in my Applefritter post (which I've linked to above).
The part that disturbs me the most is that I've seen and read about every single type of screen anomaly EXCEPT the
strange artifacts. Until I got that new SE/30 logic board with that problem, I'd never seen it myself. So despite my many years of working with old Macs, that particular problem was new to me. So I really, really want to find out what the technical reason for the problem is!
Anyway, once again,
Charlieman, please post a clean and crisp photo for us.
Thanks!