I finally got around to installing my Indivision Mk3 and was as careful as I could possibly be taking my A1200 apart, but it turned out to be not my day. Let me preface this with I know how this all sounds, but I've been repairing electronics and working on C64s for years and never had anything go this catastrophically wrong.
I took the board out of the case and removed the RF shields to get everything ready. I wanted to make sure to support the board underneath while I snapped the (presumably tight fitting) sockets on top. I had some difficulty snapping the socket down, but everything felt lined up and looked straight and flat, so pushed and snapped it down. I then tried to snap the CIA adapter in place. Powered everything up and I wasn't getting any output on the Invidision or RGB. I removed the power and took the Indivision off and despite my best efforts to be careful, turns out it wasn't seated correctly. In the process of snapping it on, I also snapped one of the small nearby 1206 68 ohm resistors in half *facepalm*. I tried to remove the CIA adapter and wound up snapping the side off the adapter's socket. Also (and I can't figure out how, but I'm certainly open to any ideas you may have), the motor on my 3.5" floppy drive no longer spins after this debacle. Possibly just a coincidence? Static discharge to the drive? I really don't know. I swapped my A500 drive in to test and it still works fine so it appears I didn't damage the A1200,
I bodged in a temporary 68 ohm resistor and that fixed the video problem and was able to get an output on the indivision, so it appears to be ok. That being said, once my 68 ohm resistors arrive and I replace the bodge with the proper SMD part, I'm going to try this again, hopefully without destroying anything else. The CIA adapter is pretty much useless at this point though. Can I purchase a new CIA adapter through icomp? Perhaps the cheaper/easier option may be for me to desolder and replace the broken socket on the adapter if you can point me to a part # from digikey or mouser.