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Got the CPU traces covered, and the ebay socket fully installed. Checked every last Address line on the Pin Matrix, all of the pins are there and connected. Will do the Data lines tomorrow.

Got most of the socket installed. There are some areas that look to have exposed traces, so I'll fix those with UV solder mask, and then finish the remaining pins. Pretty sure if I don't fix those exposed areas, a short would occurred.

Got the new CPU socket's. Dropped right in, and looks good so far. Will solder this in, and begin the Pin Matrix testing.

That flyback transformer looks in bad shape, that's likely where the burn marks are on the back of the board too. If that flyback is not working, that board isn't of much worth, unfortunately. You could try hooking the SE logic board, to your SE/30 analog board/PSU, to see if the SE logic board...

That horizontal line on the screen is where I would start. You can download the repair book, The Dead Mac Scrolls: https://archive.org/details/mac_The_Dead_Mac_Scrolls_1992 On page 49 it begins to list the steps for troubleshooting a horizontal line.

Much appreciation for the knowledge and info, thanks! I'll try to repair the stock socket before the ebay socket's arrive, but I'll solder an ebay/machine pin socket to the LB when it gets here, and test all of the traces and connections on the Pin Matrix, that way. Then decide where to finally...

A scope is always nice to have, but a microscope/magnifying light might be better. I noticed your row of U-chips is pretty corroded, specifically UE8, and UF8. There's probably more corrosion elsewhere, but zooming in you can see the rotted pins/traces, with just a camera phone and the zoom...

Got to thinking about when you said "technique", is that for the cheap ebay socket, to make it fit? Since I've not seen the problem yet with inserting a 68030 in to a cheap ebay socket: is the issue because of the alignment of the pins, or the diameter of the pin sockets, that causes issues...

I searched here earlier and others said the ebay socket worked for them. I'll look at repairing my stock socket again, but it was having continuity problems, and some of the solder that came off, was like the corroded solder from my UE10, where it sticks to everything, and globs together...

Thanks for the replies. I'm hoping to never have to remove the CPU again, if it goes in once, and all the pins have continuity, I'm happy. Are you guys saying that won't be possible with the ebay socket?

Went ahead and got the 128 pin FPGA socket from ebay: https://www.ebay.com/itm/276784142022 Mil-Max wants $30 before shipping.

Got the socket out, probably should have tried Deoxit on the pins first, as it looks good under there. Unfortunately some pins came out of the socket, and seem to be a bit rough. Should I spend time trying to repair this socket? Is there a good alternative for sale?

In getting started looking for corroded/broken traces, I looked at the SE/30 Pin matrix at the bottom of the schematic. Seemed like A(0) was as good a place to start as any. Since my CPU is socketed, and flipping the LB over trying to measure points on both sides was a hassle, removed the CPU...

Got the ASC UE10 back on, and all traces restored. No chime, no change. This all had to be done at some point, so not a complete waste of time. Will begin checking the CPU and ROM traces next.

Had to make a new trace for Pin 35 on the ASC UE10 chip, and then UV solder mask the nearby trace to keep from bridging the pins. The UE10 pins on the bottom row of the chip are not soldered in yet, and need to be bodged still, but the rest of the ASC is connected to the correct pins, and not...

Got UD12 back on and all traces properly connected. Not pretty but it's solid. Working up the courage to put UE10 back on, and bodge the broken traces. Will test it at that point, before removing TL071 and Q2, to see if any improvement or progress has been made.

Got UD12 removed. Was able to scrape the board traces, and solder the broken traces closed again, no bodge wire necessary. Will go over the bare traces with UV solder mask before installing the chip again. Will have to run wires for the broken traces on UE10 pin 19, 20, and 22, like I did...

Thanks for the info, I really appreciate it! So many sound chip problems on this board. This is giving me hope, thank you! I've looked this board all over, and there is no other corrosion near the CPU, RAM, ROM, or muxes. It was starting to worry me that fixing the ASC wouldn't cure the...

Looks like UD12 is corroded and may have some bad traces. UD12 is listed in the Serial and Sound schematic. Will remove TL-071, Q2, and UD12 in order to check the traces and remove the corrosion.

More sound chips. In fact the direct connection to the speaker.