Restoring a Mac SE 5011 in bad shape

[billbucks060]

Hi,

I purchased a cheap Mac SE 5011 as I needed to replace the floppy drive in my Mac SE/30.
I'm trying to figure out if this Mac SE can be restored, or which parts can be useful.
The motherboard (820-0250) is in a fairly bad state since the battery leaked. I removed it and cleaned the board. I'm wondering if I should put the motherboard in a little bin filled with isopropyl alcohol. It seems that the capacitors have been changed. I replaced C13 with a 33µF (25V not 16V, is that ok?) as it was damaged.
Some resistors (R5, R7..) and other components surrounding the battery have rust.
When I switch the Mac on, I get a strange horizontal line on the screen. I wonder if this is due to the board or if there's an issue with the screen.

I attached a few photos

- Is there something I can on the board to attempt fixing it (put in isopropyl alcohol container ? replace components?). Except from capacitors and resistors, is it possible to find replacements for most onboard chips such as the P9119M-2 (115-0006), DS26LS32ACN ...?
- Would it be safe to plug my Mac SE/30 working board in the Mac SE to test the screen i.e. is there no risk for the board ?
- Would the opposite also safe to test i.e. connect the Mac SE board in my Mac SE 30 ?

Thanks

 

[GreenBar0n]

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.

 

[billbucks060]

Hi
I removed the analog board. It's a 820-0206-B model, see photos. Some solderings at the back are dark (looks links something burnt).

I'm not sure O understand the suggested solution : " Check/resolder pin 1 (bottom, vertical yoke) of the j1 connector, pin 5 of the ]4 connector, and check/resolder C5 (47)j, 10V). Also see the next entry."
Should I resolder the P1 and P4 connectors' pin and replace C5 ?

Is there a list of links to find the compatible capacitors e.g for C5?

Any suggestion on what to do ?

Thanks

 

[GreenBar0n]

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 is still good. But I wouldn't connect anything from the SE/30, to that SE analog board.

 

[billbucks060]

Hi,
I changed the analog board with a working one and I noticed the motherboard ( 820-0250-A) is missing capacitor C10 (next to the battery and speaker connector). I found on this BOM that it's a 100nF capacitor like most of them on this board. Has anyone got a link or ref to pick the right capacitor ?

For instance would the 0.1µF (100nF) from this link supporting 50V be ok? https://a.co/d/aVYrp5y

Thanks