Hello
The Analog board is OK, I used another SE Board to test it and it works fine, I also installed the board in another SE/30 and it still shows the same issue: faint chime and no video (screen is totally black)
This seems to be a very early revision board, with the yellow-band capacitors.
I was looking at UE8 and I noticed that the resistance between +5V and GND is about 56 Ohms, which seems too low.
I then removed the capacitors and washed the board, now the resistance on J12 and UE8 is about 35 Ohms.
Soon I will solder new capacitors on the board, and measure the resistance again.
after washing the board (with the old caps still in place) The board produced a very faint chime, reset and interrupt also worked: I could hear the chime when I press reset and the sad mac tone when I press interrupt.
Once I recap the board, I will connect it to a Floppy drive and I'll see if it trie to read it.
Before I started working on the board, I took some photos, here are a few of them
The Analog board is OK, I used another SE Board to test it and it works fine, I also installed the board in another SE/30 and it still shows the same issue: faint chime and no video (screen is totally black)
This seems to be a very early revision board, with the yellow-band capacitors.
I was looking at UE8 and I noticed that the resistance between +5V and GND is about 56 Ohms, which seems too low.
I then removed the capacitors and washed the board, now the resistance on J12 and UE8 is about 35 Ohms.
Soon I will solder new capacitors on the board, and measure the resistance again.
after washing the board (with the old caps still in place) The board produced a very faint chime, reset and interrupt also worked: I could hear the chime when I press reset and the sad mac tone when I press interrupt.
Once I recap the board, I will connect it to a Floppy drive and I'll see if it trie to read it.
Before I started working on the board, I took some photos, here are a few of them