ive been working on dead SE/30 boards over the last couple days. You may have created multiple problems here. One:

You lost an address line. You have to grab the schematics and start testing for shorted/open address lines back to the ROM SIMM from the peripheral ICs. 

Keep in mind A0, and A1 is not on the ROM SIMM, but you can pick them up at the GLU. 

These lines usually break around the ASC, and the SCSI ICs. I have also seen them break between the SCSI and SWIM, but that wont stop it from powering on. 

Two:

Also the video will generate the initial state of the VRAM. Depending on the manufacturer of the VRAM, youll have zebra stripes, checkers, classic simasimac, depends on who made the VRAM wil depend on what shows on the screen. 

But if you have nothing on the screen, start at UE8.