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Bought an ME66 capsule and the K6 power module was still attached when it arrived.
I popped in a battery, and it worked great but heard hum, switched to phantom and got nothing but hum, no signal.
I know about the screw grounding issue, and fixed the hum right away, now battery is crisp and phantom is just silent. Swapped out for my other K6, and the ME66 worked on both battery and phantom power, so I know it's this used K6.

Before i request a quote from Sennheiser service, has anyone seen this and have a solution/suggestion I can look into?

paulears Thu, 03/28/2019 - 01:51

As you had to fiddle to get hum free, I wonder if the old owner never had phantom and used the battery and maybe fiddled with the wiring - turning it unbalanced, maybe shorting 2 or 3 down to 1? This wouldn't matter on battery but would kill phantom? Pop a meter between 1 and 2, then 1 and 3 on the ohms setting and see if they are the same. If it's been messed with, one will be a short.

JohnSLC Sat, 03/30/2019 - 13:25

The phantom power is coming from a zoom H6, which is working fine with my other k6 module.

I went ahead and gave it a thorough cleaning and brighten up all the contacts and that's when I noticed that the number one pin of the XLR connection was loose and if I cheated the XLR cable towards that pin the phantom power would kick in.

I don't see how to get to the XLR connection without removing other solder points on the circuit board so I'm leaning towards trying to get it serviced

paulears Mon, 04/01/2019 - 08:25

Well, you n' really make it worse? Seriously though, the pcb is pretty easy to access, and the likely problem will be a simply dry joint which goes low resistance when you put pressure on it, going hi-res when you take the pressure off. These kinds of faults are the simplest to fix normally.