blindowl
Well-known member
Yeah, already tried that, unfortunately.
Chips are very clean and seated properly.
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Classic II – won't start after cleaning
- Thread starter blindowl
- Start date
Chips are very clean and seated properly.
3lectr1cPPC
Well-known member
Huh? The classic II doesn’t need a battery to start. That’s systems like the Mac II big box series and the 475 series macs
I've also had garbled screen caused by Egret problems.
This is not true. A Classic II does not need a battery to start.
blindowl
Well-known member
Since my last post I've put this project aside for the moment.
Summery of what I've done:
• Replaced all caps on the logic board
• Adjusted the voltage rails on the analog board
• Changed to another pair of RAM modules — computer now actually started to boot normally, but with intermittent issues. I SHOULD’VE STOPPED HERE!
• Soaked the logic board in vinegar and rinsed with water — BAD IDEA! Now it didn’t start at all... (the start of this thread).
• Soaked the logic board in vinegar again, rinsed with IPA.
• Replaced a missing/damaged micro cap on the back of the logic board
• Removed and cleaned the Egret chip — computer started again! PHEEEW
• Replaced several caps on the analog board
• Re-adjusted the voltage rails
• Replaced the onboard RAM chips — twice!
• Replaced all capacitors (except 2 × 1 uF) on the logic board — again! Better soldering job this time
Issue is virtually the same. Just another pattern on the screen (after the swapped RAM chips I guess). Pattern is less garbled, though.
One day I will remove and clean the Egret chip again. Then I'm out of ideas. I've beeped the most obvious components and traces with the multimeter, and everything has been normal.
Summery of what I've done:
• Replaced all caps on the logic board
• Adjusted the voltage rails on the analog board
• Changed to another pair of RAM modules — computer now actually started to boot normally, but with intermittent issues. I SHOULD’VE STOPPED HERE!
• Soaked the logic board in vinegar and rinsed with water — BAD IDEA! Now it didn’t start at all... (the start of this thread).
• Soaked the logic board in vinegar again, rinsed with IPA.
• Replaced a missing/damaged micro cap on the back of the logic board
• Removed and cleaned the Egret chip — computer started again! PHEEEW
• Replaced several caps on the analog board
• Re-adjusted the voltage rails
• Replaced the onboard RAM chips — twice!
• Replaced all capacitors (except 2 × 1 uF) on the logic board — again! Better soldering job this time
Issue is virtually the same. Just another pattern on the screen (after the swapped RAM chips I guess). Pattern is less garbled, though.
One day I will remove and clean the Egret chip again. Then I'm out of ideas. I've beeped the most obvious components and traces with the multimeter, and everything has been normal.
chrisrueckert
Well-known member
Did you ever retry to fix the Classic II? I'm curious to know as I have a similar issue with mine.
