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Can I use a Motorola MC68030RC33B in an SE/30? https://www.ebay.com/itm/371776928912. The CPU my SE/30 came with was a XC68030RC16B, which seems to be very rare and I can't find an exact replacement.

Going to have to try ordering another CPU, want to replace it with the same I already have.

Tried the CPU walk the bus test and I can't get a square wave from any of the ROM slots, the wave form is a mess, with varying speeds, nothing is consistent. Is there any way to tell if a CPU is bad without another one to test with?

I was measuring RP7 pin7, not Pin2, Pin2 goes to 0V with Reset, RP7 is working correctly, my mistake. Added sockets for UB10 and 11, the Sony Sound chips, cleaned the board underneath thoroughly. I can get Pin5 on both UB10 and 11 to go to 0V with the Reset button, but Pin6 only drops to...

I did setup my scope better, I guess I won't worry about the slightly slower speeds 3.67MHz vs. 3.9 Mhz, all the clocks are where they're supposed to be. I moved on to the Reset portion of the guide and I definitely have a problem here: UB11 pin6 only drops to about 4V with the Reset. RP7...

Went through the clock signals and not sure what to make of this. The C16G clock running the same speeds as C16M seems odd since all of the C16M clocks were exact. The E clock is off too. But the strangest is the C3M clock wave form, when compared to the others, this is C3M running slightly...

UE10 was confirmed to have 5V at pin 35 and the Reset is working also, UE10 appears to be in good order. Will check the clocks tomorrow.

Got confused by the pin count, all the UE10 pins are now connected correctly and not missing anywhere. Still Simasima and no sound. Will keep going tomorrow.

After going through the Simasima Repair Guide from TD.com, it is recommended to start with UE10 ASC sound chip, as everything crucial to boot passes through there. Printed out the Address and Data line matrix and went through all of the UE10 pins, back to the ROM slot. On the very last pin to...

Thanks for the encouragement! I'm determined to get this going one way or the other :)

Should've looked before asking, that video must be referencing the 128-512K models. Thanks!

Alright back at this. I have a Reloaded V5 Purple board that is due to arrive tomorrow, thanks to @schrockwell, but I'm going to give my stock board every last chance to work before scrapping it. Still no chime, just an audio pop on boot and static through the speaker or external audio jack...

Thanks for clarification. I ordered (2) sets of the PLCC20 sockets just in case something goes wrong. Also appreciate the BOM from Digi and Mouser.

@schrockwell, regarding the PLCC20 sockets: ebay shows these as $1.80 for (3). How did you end up spending $13 on these - according to your inventory list above - if the shipping is $5.25 and the (3) sockets for UD12, UE12, UH7, are only $1.80? How many of these PLCC20 sockets did you end up...

Congrats on your success with your SE-30! Ordered a Purple board. Thanks!

Thanks so much for the encouragement, it really does mean a lot to me :) Using a magnifier headset with LED's on it is the only way I could see what's going on here, would really like one of the fancier microscopes, so I could get over 2X-4X magnification. The pro repair guys all have...

I would fix every rotten trace on this board, no matter how long it took, if it were to even produce a Sad Mac error code, or a sound. I tested the UE8 connections with a meter, to figure out what was broken; UE8 was entirely replaced. I should have screen artifacts, or missing video lines if...

Would've liked one of these boards in black or purple, can't do red.

1. I'm getting 5.04V at pin-5 of both UB11 and UB10, and they both go to 0V with the Reset button. 2. Was able to see UI6: 32MHz on Pin-1, and 16MHz on Pin-17, and Pin-2 Thanks! Good to know, thanks!

Definitely did try headphones, same click-pop noise as the speaker. You can see how nasty my sound chips are though, UE10 was already removed and replaced.