Classicman
Well-known member
Hi all!
I'm trying to bring back to life my Mac Classic II (with logic board rev B).
Briefly my story: (Sorry for my bad english!)
I buy this Mac Classic II on the internet which initially worked without problems but only the sound did not work.
One day I go to turn it back on and nothing ... bad news: checkerboard on video (normal brightness on video)!
I gradually managed to recover all the capacitors to replace on the logic board.
So I have installed all ceramic capacitors but only the three 47 microfarads I was forced to put them electrolytic smd.
Now, when I go to boot it up with the recapped logic board, I get the typical checkerboard screen (now very low brightness) and no boot chime but fan spin and the hard drive run. Rarely large vertical lines appear in place of the checkerboard, always with low brightness.
Making attempts with the recapped logic board and keeping it on with the on-screen chessboard, I suddenly hear the Classic II start-up sound! and the screen starts up at the right brightness and arrives at the floppy disk screen with flashing question mark (I had unplugged the hard drive).
Incredulous and happy, I wait a few minutes and the question mark continues to flash smoothly. So I turn off the Classic II, plug in the hard drive power connector, turn it on and ... nothing more ... the usual low brightness chessboard. And nothing… is not wanted to boot again.
I've checked with a multimeter the 12 and 5 volts on the hard drive connector and the results are 11.84 and 4.95. Are these values okay? I think so...
Now my thoughts are on the analog board. Should I recap that too? Can you explain to me this one strange unique correct boot of my Mac with the amazing sound working?
Thanks you all that can help me!
I'm trying to bring back to life my Mac Classic II (with logic board rev B).
Briefly my story: (Sorry for my bad english!)
I buy this Mac Classic II on the internet which initially worked without problems but only the sound did not work.
One day I go to turn it back on and nothing ... bad news: checkerboard on video (normal brightness on video)!
I gradually managed to recover all the capacitors to replace on the logic board.
So I have installed all ceramic capacitors but only the three 47 microfarads I was forced to put them electrolytic smd.
Now, when I go to boot it up with the recapped logic board, I get the typical checkerboard screen (now very low brightness) and no boot chime but fan spin and the hard drive run. Rarely large vertical lines appear in place of the checkerboard, always with low brightness.
Making attempts with the recapped logic board and keeping it on with the on-screen chessboard, I suddenly hear the Classic II start-up sound! and the screen starts up at the right brightness and arrives at the floppy disk screen with flashing question mark (I had unplugged the hard drive).
Incredulous and happy, I wait a few minutes and the question mark continues to flash smoothly. So I turn off the Classic II, plug in the hard drive power connector, turn it on and ... nothing more ... the usual low brightness chessboard. And nothing… is not wanted to boot again.
I've checked with a multimeter the 12 and 5 volts on the hard drive connector and the results are 11.84 and 4.95. Are these values okay? I think so...
Now my thoughts are on the analog board. Should I recap that too? Can you explain to me this one strange unique correct boot of my Mac with the amazing sound working?
Thanks you all that can help me!