after cleaning and re-greasing the RA drive of my Meade 10" LX200GPS, I put everything together carefully, but apparently not careful enough. When switching on, the red power LED wouldn't come on. Suspecting the power supply I replaced it with the motorcycle battery that I use for outdoors and produced a small smoke signal from the front panel electronics. In the aftermath troubleshooting I found a trace on the board that had been fried, but everything else seemed to be ok when comparing continuity tests with the circuit diagrams I have, so I soldered in a small wire, replacing the burned up trace. Switching on, the scope looked like it worked again.
This was when the bottom cover was still missing. Then I put the cables back into their places and fastened the electronics boards in steps, testing in between whether it still worked. Eventually I closed the bottom plate and suddenly the mount started to behave erratically when switching on, after it had worked at every step. It looked like runaway motors in RA and DEC as described for the classic LX200, although this is a GPS. Removing the bottom plate and going back the steps didn't bring back the normal behavior. I could never get it to work again with this main panel.
However, swapping the panel out for a good working one, a friend was so kind to let me try, brought the scope back to life. So I know the main panel has a problem but I can't figure out what might be broken. We even updated the firmware on the bad board which worked fine. We just disconnected the board from the motors and it operates ok. All menus are there but switching it on with the motors connected, it first starts to move in DEC and then after a few seconds in RA as well. It doesn't recognize the end points and I have to open the clutches to prevent the motors to stall and smoke up. When doing this a little longer, the motors eventually stop and go into the opposite direction, so it seems the software is trying to do something but isn't quite getting the feedback it expects.
In any case. I have two obvious questions to this community: 1) Does anybody have an idea what could be broken that still can be fixed without sending the unit to Meade and 2) Does anybody have an unemployed LX200GPS power panel lying around that I could obtain for a reasonable price?
All the best,