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(1) The onboard memory is also what I suspect could be the culprit but it is difficult to verify.  (2) The display chip can be a suspect since it displays nothing other than blank/blue screen.  (3) A broken wire somewhere onboard is likely but so far I cannot find any broken trace.  I think we...

Also, good to hear from zezba9000.  Congrats on the progress in the PSU experiment -- very educational!

Yes, I got two IIsi.  Both have exactly the same "chime of death" problem.  It seems unlikely to be a coincidence.   Their root cause must be the same.  Wish someone can triangulate the culprit from these discussion which at the moment is hitting a wall.   We need a Sherlock Holmes.

@zezba9000 You got very useful details to use an ATX PSU.  Good job! It's nice that we can rule out any ROM SIMM issue and focus on other possibilities.   Your new working motherboard will be really useful for comparison. My board looks the same as your new one with onboard ROMs (these...

Any luck with BOMW and the new motherboard?  My perfectly working ROM SIMM is a stock one that came with IIfx.  Hopefully, we can rule out ROM SIMM being the issue once and for all.

Mine is the version w/ built-in ROM.  I had also tried putting a IIfx ROM SIMM in -- didn't help.    It's great that you rule out the PSU issue.  Have you tried tracing wires?  I had hunted for broken traces in multiple attempts but could not find anything trivial to fix the death of chime sound.

@zezba9000 No, I haven't tried ATX PSU because I think my IIsi PSU is in good shape after partial recap.  It can be turned on with the power button at the back (before recap, it powered on whenever the power cord was plugged in).  So, I suspect the culprit is still with the motherboard...

I have a similar problem.  You can find my post back in 2016.  Recapped both the motherboard and PSU -- did not help.  The problem remains.  I have found others having similar issue with IIsi.   It looks like a common hard problem that is likely similar or even the same.   I have a feeling if...

Hi megabyte, did you get your SE/30 working successfully with a M1212 Apple CRT?   I am trying to get a SE/30 Pivot to work with Apple M0401, but to no avail.

Mine is M0401 which has the same 640x480 @ (H:35kHz V:67Hz) as M1212.    I would really like to learn from megabyte if he got it working with M1212. But I can only find that he got it working with a NEC LCD monitor.  I will remain a doubting Thomas that Pivot can work with a 640x480 Apple CRT...

Thank you Themk!   You are very right and you said "one should be able to connect the R,G and B lines all together to get white" and "you may not need to amplify and split the signal, just electrically connect them all together".   So, lol, actually I was following your direction.   :b&w: ...

Here is my last mile: By pure impulse, I reset my LG LCD to factory default setting.   This synced the signal.   All of a sudden, I can see System6's extended desktop on my LCD (although it continued to remain blue, which may not be too bad for the eyes).    Then, I traced the pins from the...

Thank you very much guys!   Finally breakthrough in my LCD/VGA setup!     My SE/30 has changed from blue  :beige: to white  :b&w:

Very nice color, Eagle!   I would like to get one of these IIsi cards if it can work with my Apple CRT.

Thanks again Trash!   That link is great!   I am pleasantly surprised you came up with many useful stuff even before effect of caffeine.   Unfortunately, both my Apple CRT and the Pivot card seem very stubborn and nitpicking on what they are compatible with. I have a feeling the Apple monitor...

If I locate the pin numbers correctly: LEFT: MAC-to-VGA cable (connect to LG LCD native@1920x1080):   pin 3 and 8 are missing. Interestingly, with this adaptor, my LG LCD thinks the video signal from the Radius card is 1440x900@69Hz. But my radius driver thinks the monitor is 640x864. The...

The default resolution is "incorrect".   Please see snapshots. Findings: 1. as you can see in the Monitor section, the system incorrectly assumes my display to be a 640x864 portrait screen (my CRT is 640x480).  2. in the PDS section, the driver index is "-50" which is linked to a driver named...

A great collection u got there.   It's the first time I see a dial adaptor.   Ingenious design!    I am late to the game of collecting 68k machines and only have a couple. Many of u guys in this forum must have a museum of them in your dungeon.   :b&w: Thanks for summing up the mechanics...

Thanks a lot for the info with such clarity!   It shows one can always learn something by asking.      :) I am amazed to learn the driver is already in the card, ready for the OS to deploy its basic functions.   Such a good idea of the time!   It feels like truly consumer electronics.  ...

Yeah, thanks!   I actually didn't understand what a DeclRom was and likely still don't but was hoping not to give my ignorance away by asking.   Hey, but I do understand what a splash screen is, especially when I saw one on my LG LCD myself because at the beginning I only used Apple CRT which...