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SE/30 Screen Shaking

George

Member
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.
 

Attachments

  • 1_購入当時の写真.jpeg
    1_購入当時の写真.jpeg
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  • 2_コンデンサ交換後.mov
    1.4 MB
  • 3_パターン、IC交換後.mov
    4.5 MB
  • image8.jpeg
    image8.jpeg
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George

Member
Hello everyone. I don't give up yet.
And there was a change in the situation.
I clean up ROM SIMM's terminal and slot carefully .
Then, SE/30's screen shake was gone! :)
But, SE/30's screen got stripe line.
image2 is that state.
I cleaned up around video logic,but did not change state.
So, I want to get screen shot, and ask to advice in this forum.
This time, SE/30 got good screen at once.
image0 is that state.
But, that state was only one time. My SE/30's screen is image2's state right now.
Please tell me the solution of this issue.
 

Attachments

  • image2.jpeg
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  • image0.jpeg
    image0.jpeg
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joshc

Well-known member
On second thought (actually, because someone who knows better than me saw my post and messaged me about it) this is more likely a bad address line to the muxes - the traces around there may be damaged from the capacitors leaking previously. Check all the connections for the muxes to see if there's a bad trace there.

1635175075965.png
 

George

Member
On second thought (actually, because someone who knows better than me saw my post and messaged me about it) this is more likely a bad address line to the muxes - the traces around there may be damaged from the capacitors leaking previously. Check all the connections for the muxes to see if there's a bad trace there.

View attachment 35240
Thanks.
Maybe, 2nd advice is right.
Because, I have another VRAM chip, and I changed before. But didn’t change state.
I checked these connections before, but the situation was changed. So, I will try it again.
 

George

Member
Hello everyone.
My SE/30 is back!
UD8 to A0 pattern was disconnected, so I bypassed to UE10.
Then, SE/30's screen was clear.
Thank you very much!
 

Attachments

  • image03.jpeg
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  • image04.jpeg
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