SOURCE: mackie 450 thermal light on no sound
could you give some more info? what are your running into your speaker? and how exactly is it run? once we weed out common issues like switched up cables, than we can move on to internals.
which on that note, I think this is a manufacturing defect
here's a link to the schematic if you want to go poking around the circuits.....
http://www.mediafire.com/?myion3zkxn3
or
http://www.mediafire.com/file/myion3zkxn3/Mackie-SRM450 actspk.pdf
take a resistance test between D56 pin1 and Q35 pin2. thats where this issue seems to be stemming from from ones ive worked on. I have know it to be an internal track that was broken and needed to be glued back down. definitely not the first time ive seen this....
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