SE/30 no video, death chime

[Duke09]

Hello, I’ve got this SE/30 that I’ve been trying to troubleshoot for quite some time now. It’s been recapped, the analog board works with a working SE/30 board. I’ve tried and swapping all the swappable chips from my good SE/30 board to my bad one, no difference. Replaced UE8, UF8 and the 31.3mhz clock crystal. When I hook it up in diagnostic mode over serial I get FFFFFFFFF000E indicating a bus error. However if I use one of the new made ROMs from Garrett’s workshop I get a happy then sad chime with the error 000000500011 in the diagnostics mode. I also of course used the rom from my working SE/30 but still produces all F’s. Not really sure where to go from here, I’m starting to suspect possibly a faulty CPU, although my next plan was to replace the 74F253 chips. Anyone have any ideas here?

 

[pff000]

Hello, I’ve got this SE/30 that I’ve been trying to troubleshoot for quite some time now. It’s been recapped, the analog board works with a working SE/30 board. I’ve tried and swapping all the swappable chips from my good SE/30 board to my bad one, no difference. Replaced UE8, UF8 and the 31.3mhz clock crystal. When I hook it up in diagnostic mode over serial I get FFFFFFFFF000E indicating a bus error. However if I use one of the new made ROMs from Garrett’s workshop I get a happy then sad chime with the error 000000500011 in the diagnostics mode. I also of course used the rom from my working SE/30 but still produces all F’s. Not really sure where to go from here, I’m starting to suspect possibly a faulty CPU, although my next plan was to replace the 74F253 chips. Anyone have any ideas here?

you could try using the diagnostic mode described in this video to run some tests via the serial port,

I’m not sure if it would help but could be useful to narrow down the problem.

 

[djc6]

Garrett’s ROM (and most/all aftermarket ROMs) skip the RAM check - is that maybe why you get a happy Mac boot sound with that rom?

What RAM do you have installed?

 

[Duke09]

Garrett’s ROM (and most/all aftermarket ROMs) skip the RAM check - is that maybe why you get a happy Mac boot sound with that rom?

What RAM do you have installed?

Just various ram stick it’s matched pairs installed, but no matter what combination they are in or if any, same results. I should be getting at least jail bars with nothing installed but I don’t.

 

[GiGaBiTe]

SE/30 requires four SIMMs for the 32 bit 68030 bus. I think you can put them in either the four upper or four lower slots.

Instead of firing the blunderbuss with parts, you should start checking the traces. If you're getting a bus error, there's probably broken traces or VIAs somewhere.