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| Dead Mac II |
Posted by: Unknown_K on 2020-01-27 20:07:50
Recently I snagged an original Mac II for the collection.
I removed the soldered on batteries and installed a battery holder (stolen from my spare IIx) and replaced the old SMT capacitors.
Machine will not turn on with keyboard or back button, swapped a known good PS in same thing.
Jump started it with a battery and it does power on and the fan in the PS spins but no bong. Turns off with the back button but won't turn on again.
Any ideas?
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Posted by: LaPorta on 2020-01-28 03:10:04
Likely rotten traces from leaking capacitors. Especially in the right-rear of the MB near the RAM, there can be eaten traces from the old caps. I had to patch at least one to get mine to work. If you have photos of the board, that would help greatly.
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Posted by: MJ313 on 2020-01-28 05:42:29
This may be helfpul for you 🙂
https://www.downtowndougbrown.com/2015/03/explanation-of-the-macintosh-iiiix-power-onoff-circuit/
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Posted by: Unknown_K on 2020-01-29 07:56:58
Nice link MJ313
Under the System will not power on there are 2 links to this forum showing where the traces are. The second link is dead.
https://68kmla.org/forums/index.php?/topic/20403-mac-ii-powers-on-but-does-not-chime/?p=207088
Anybody have that picture?
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