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| Mac Classic loud hum from PSU when attempting to start |
Posted by: Rick Dangerous on 2017-09-13 12:24:48
I will admit it's been about five years since i fired up the ole' classic.
When I tried to last night, there was a disturbing loud humm (electrical sounding) coming from the PSU area.
I opened her up and all the boards are good, no exploded caps or PRAM batteries that I could see.
Of course I don't know much about CRT tubes or PSU's so i left those alone not wanting to electrocute myself.
Has anyone encountered this before? I do have a local electronics guy who is a wizard with soldering and electronics and has been doing it professionally for 35 years.
If this is something that could be easily fixed I would like to do so before salvaging parts and going the Macquarium route.
Thanks!
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Posted by: bibilit on 2017-09-13 12:44:14
The Classic is known for failure in the PSU area.
Never seen exploded capacitors, most of them are leaking heavily instead...
Around 10 to be replaced.
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Posted by: Rick Dangerous on 2017-09-13 13:39:21
So likely capacitors in the PSU then? Thanks again.
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Posted by: BadGoldEagle on 2017-09-13 14:16:50
bibilit is right. On the Classic, the caps are not of the explody type, but they are definitely leaking. I just recapped a TDK PSU from an LC II and the caps were completely shot. Sometimes you can't really tell if they're leaking or not before removing them...
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