Hello everyone, nice to meet you. I got a bad Macintosh SE/30.
At first, it had no chime, but OS was run. And The screen has like checkered pattern.
First image is that state.
So, I recaped logic board. SE/30 got chime, but screen didn`t change.
I tried to wash logic board. Then chime add noise, and screen was shaking. :<
2nd movie is that state.
I got SE/30's schematic, and searched a circuit disconnect.
I repair some disconnects, then SE/30's chime was clear!
Next, I removed UA8 - UG8, and resoldering, then I got SE/30's screen without checkered pattern!
But, screen shaking was there.
3rd movie is that state.
A part of floppy was indicated.
4th image is that state.
I have good Macintosh SE. And I connected SE's logic board to SE/30's analog board and PSU, CRT, the screen was not shaking.
Then, I connected SE/30's logic board to SE's analog board and PSU, CRT, the screen was shaking
SE/30's PSU can output over 5v & 12v voltage.
So I think, logic board's issue.
I searched a circuit disconnect about vsync. But I couldn't find.
I'm stuck.
I'm sorry I'm not good at English, so maybe you can't understand to my information.
But please help me.
At first, it had no chime, but OS was run. And The screen has like checkered pattern.
First image is that state.
So, I recaped logic board. SE/30 got chime, but screen didn`t change.
I tried to wash logic board. Then chime add noise, and screen was shaking. :<
2nd movie is that state.
I got SE/30's schematic, and searched a circuit disconnect.
I repair some disconnects, then SE/30's chime was clear!
Next, I removed UA8 - UG8, and resoldering, then I got SE/30's screen without checkered pattern!
But, screen shaking was there.
3rd movie is that state.
A part of floppy was indicated.
4th image is that state.
I have good Macintosh SE. And I connected SE's logic board to SE/30's analog board and PSU, CRT, the screen was not shaking.
Then, I connected SE/30's logic board to SE's analog board and PSU, CRT, the screen was shaking
SE/30's PSU can output over 5v & 12v voltage.
So I think, logic board's issue.
I searched a circuit disconnect about vsync. But I couldn't find.
I'm stuck.
I'm sorry I'm not good at English, so maybe you can't understand to my information.
But please help me.