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Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40.

Most often the capacitors on the analog board have leaked. The board should be cleaned and recapped. You need solder equipment to do this, but there are tutorials where you can learn how it is done. But as cheesestraws said: there can be dangerous voltages, when you work with analog boards!

To see if the voltages are stable, you need an oscilloscope. The rebooting can be a sign of changing voltages. Did you change any of the following parts: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40?

There are a lot of parts on classic AB that can be defect. Most often: DP3 and DP4 (1N4148), TDA4605, CNY17G, IRFBC40.

https://68kmla.org/bb/index.php?threads/recapped-macintosh-classic-with-checkered-screen.41225/

Ok, one correction. I think it was RAL 1000 that I used. Next week I could take a look at the can and tell you exactly.

I used RAL 1001 for a 1/3 Mac with a raspberry pi inside.

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Could be that you get another sad mac error after changing the two chips. Perhaps you have to change more than the two. The RAM chips are often defect.

043000 means that RAM G9 and G10 are defect. http://myoldmac.net/FAQ/SADerror-earlymac.htm I would use sockets for all RAM chips that you desolder. You should be able to use any 4164 DRAM chips you can find.

http://myoldmac.net/FAQ/SADerror-earlymac.htm Look at the sub code bits. The code is hexadecimal (0..F), so if the sum of one bit is 10 then you get an A and so on. Perhaps you can use sockets for the new RAM, then it is easier to change them in the future.

If my interpretation is right 04919A means the following: 9 = G12 + G9 1 = G5 9 = F12 + F9 A = F8 + F6 Hope it helps... May be it is time to change all RAM chips.

Is there a bong when the plus boots? If not, then it may be a problem with the ROM.

There are different versions of ROMs. You have to look, which version you have. And the plus ROMs are split into two files (high and low). Here you can find two windows programs to split and compare roms. https://68kmla.org/bb/index.php?threads/software-for-roms.32011/

A 01 error means that there is a ROM error. Plus ROMs are sometimes defect. You can burn new ROMs with an eprom burner. https://www.instructables.com/Create-Macintosh-Plus-ROMs/

This site may be of interest for you. There is a part about serial connection: http://www.applefool.com/se30/#serialdata The third cable could be, what you need: http://www.applefool.com/se30/images/img/1yq5cpr6.png File-Sharing: https://www.jagshouse.com/filesharing.html

Mac Classic & SE from Larry Pina could help you. Perhaps you send me a PM?

When the classic boots with another LB then your problem is the LB and not the AB. Did you wash the board, when you recapped it? The fluid of the caps must be removed. You can use a toothbrush and water with a little bit of soap. Then rinse the board with IPA and let it dry. I use an oven at...

Did you recap the logic board? Did you measure the voltages at the floppy port (5 & 12 volt)? Did you recap the analog board? Most often a recap solves problems with the classic. If the ROM is defect you can buy a battery bombed board and use that ROM. Or you can burn a new one...

Voltages are ok, perhaps you could measure with an oszilloscop, if they are stable? But when you recapped the AB, they should be stable. Are there chips that are getting hot? Could be a temperature problem when the SE freezes after some time.