I changed my FC in my ZMR 250 (X8R to XSR ...worked fine) and then I did some work on the video gear.....had an electric problem but it got fixed.  So I went to fly the thing and I connot get telemetry from the FC (Naze32 rev6 full)  I checked all the settings and I am getting battery voltage in CF.  So I swapped it out with another board I had and now I get telemetery, but the board wont arm?!?!?!  Two identical boards with identical configurations in the same machine, wired the same way and they do two different things?????  The only thing I can figure is that both boards are bad, but in different ways.  Thoughts/comments/advice???  Thanks guys.

on the board that won't arm, have you checked the status in CLI?

Not specifily for that, no.  Before I started messing with it, I dumped the settings I was using  in the board that was in there....which was working fine.  I reladed those settings into both boards and now they don't act the same way?  I'm befuddled. Now one thing I didn't mention....when I was working on the video gear there was a momentary short and I heard a slight pop and the video went dead.  I found the problem and fixed it and although it wasent the FC, I'm wondering if it could have caused a slight surge and screw it up?

Problem solved...sort of.  It just started working....no idea what I did, but I've probably got an intermittent problem that is going to raise it's head again at an inopportune time, I'm sure. Anyway...for now, if it ain't broken, I can't fix it.  Thanks for your response Jimmy.

(26-Aug-2016, 11:51 AM)sirdude Wrote: Problem solved...sort of.  It just started working....no idea what I did, but I've probably got an intermittent problem that is going to raise it's head again at an inopportune time, I'm sure. Anyway...for now, if it ain't broken, I can't fix it.  Thanks for your response Jimmy.

Don't you just "love" those problems that solve themselves....(well, not really). 

I "love" it until they "UNsort" themselves.........

For me these mysterious problems are normally caused by a loose cable/components somewhere.. Or solder pads half falling off

That's what caused the original problem with the video, a solder pad lifted.  It was on the negative side so I just soldered a wire to the negative side of the voltage regulator output and tied that into the negative side of the VTX/cam circuit, bypassing the bad trace on the circuit board.  I agree with your assessment, I've got something loose and I just haven't found it....yet.  Thanks Oscar.