UPDATE
I have gotten ahold of a working Mac SE that I can exchange parts with and I have gotten some new clues:
The shadowing and slight bulging problem is somewhere on the analog board. Swapping only that board and keeping the old power supply and video board that mounts on the back of the CRT, the shadow problem disappears.
The screen still has low brightness with the known-good analog board. I also tried swapping in a known-good power supply and that made no difference. I have yet to swap the video board that attaches to the back of the CRT, but I will do that soon to rule that out. As suggested earlier, the CRT may just be old and tired, and not as bright as it used to be. This really is OK at maximum brightness, though.
So I guess at this point, it's a matter of troubleshooting the analog board. I have noticed that the hot glue on the width adjustment (a variable inductor) has gotten hot and curled away from it due to the heat. Also the board has some dark spots on it nearby. Also, C12 has a big long, clear, waxy drip running down the board from it, but this isn't an electrolytic cap, so I don't know what to make of that. Other than this, the board and components are remarkably clean. If I didn't know better, I'd say the board is almost brand new just by looking at it.
It seems to me that a good thing to try first would be to replace the variable inductor just because of the visual clue. This is component L2. I don't really want to take the one off of my good board, so is there anyone that knows the specs for it so I could just get a new one?
I have gotten ahold of a working Mac SE that I can exchange parts with and I have gotten some new clues:
The shadowing and slight bulging problem is somewhere on the analog board. Swapping only that board and keeping the old power supply and video board that mounts on the back of the CRT, the shadow problem disappears.
The screen still has low brightness with the known-good analog board. I also tried swapping in a known-good power supply and that made no difference. I have yet to swap the video board that attaches to the back of the CRT, but I will do that soon to rule that out. As suggested earlier, the CRT may just be old and tired, and not as bright as it used to be. This really is OK at maximum brightness, though.
So I guess at this point, it's a matter of troubleshooting the analog board. I have noticed that the hot glue on the width adjustment (a variable inductor) has gotten hot and curled away from it due to the heat. Also the board has some dark spots on it nearby. Also, C12 has a big long, clear, waxy drip running down the board from it, but this isn't an electrolytic cap, so I don't know what to make of that. Other than this, the board and components are remarkably clean. If I didn't know better, I'd say the board is almost brand new just by looking at it.
It seems to me that a good thing to try first would be to replace the variable inductor just because of the visual clue. This is component L2. I don't really want to take the one off of my good board, so is there anyone that knows the specs for it so I could just get a new one?