the easiest thing to do would be to get a new master section board. mackies use surface mount tech and it's not easily repaired ... the whole idea is to just replace the boards.

Thank you for your response. I've been looking on line for Master section parts but have had no luck. Thanks again.

The 2nd power port was to power a sidecar, right? Are they both the same gender? If mine had a 2nd port, it had a cover screwed over it. I don't feel like digging it out of storage to see.

The good news, it's probably some piddly little part(s) (diodes, resistors, etc.) - the bad news it is going to be a beast to fix. First, I don't envy anyone who has to crack the chassis open and remove a circuit board on one of those. Second, the tiny surface mount parts Kurt is referring to are often buried in really difficult places to conserve space. (in addition to being too small to work with using normal tools they hide them under connectors and other parts)

 
[ A modern surface mount resistor on a US Quarter ]

I replaced one last week on something and I have neither the eyesight, nor the [="http://www.mcmelectronics.com/product/21-8230"]SMD tweezers[/]="http://www.mcmelect…"]SMD tweezers[/] & [[url=http://="http://www.mcmelect…"]SMD heat gun[/]="http://www.mcmelect…"]SMD heat gun[/] for such tiny repairs. I had to use a very small tipped [="http://www.mcmelectronics.com/product/96-080"]12w mini-iron[/]="http://www.mcmelect…"]12w mini-iron[/] and a large lighted magnifier.

Have you called, or emailed, the fine folks in [[url=http://="http://mackie.com/s…"]Woodinville[/]="http://mackie.com/s…"]Woodinville[/]? It's either that or watch eBay for parts.

Best of luck.

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In my own experience with Mackie gear, you're best off to get it serviced by them or an authorized repair center.

I agree with Hawk, Mackie's are very tough to service in a DIY capacity, unless you really know what you are doing and have the right tools to do it with... and the vision to see the parts, which seem to me to be almost microscopic in nature, and as mentioned, access to the various components is incredibly limited..

If you could find a replacement master board section, as Kurt mentioned, that would be your best bet.

You may have shorted some pin or blown a cap or resistor in the power supply to that 7 pin connector.
There might not be anything wrong with the actual section board itself.
You should take a meter and schematic to check power is good to the section board first. You might be able to do that without the master board plugged in at that connector. But without a schematic hard to know if it needs to be plugged in or not to test the power supply.
if your a good technician and can troubleshoot to the component level you should be able to find the problem and replace the bad part SMD or otherwise.
If that isn't possible I would take it into a component pro audio service shop and have them fix it.
Need to know what's wrong before just ordering boards and plugging them in....there's always a chance you can damage a new replacement board without first finding out the problem. A big waste of money going that route.

i see those things on the CL on the cheep all the time... might be easier to just get a new (old) board.