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Hello ladies and gentlemen, I find myself the operator of a Typhoon H Plus with the Intel Realsense option, and have replaced a couple arms that were busted in one fashion or another.

At this point, I'm under the assumption that the arm replacement has gone relatively successfully because it powers on, is communicating with the base station, and is growling at me. I will post a video of the Typhoon powering on (following up until this point the "recommended" procedure of letting the ground station boot, then powering on the drone) to show you all where I'm at right now.

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Where do we go from here? It's telling me to perform a compass calibration, but not giving me the option, OBS Avoidance not available, it can't acquire GPS (it couldn't when it was functional and flying, either), and the indicator lamp is pulsing red while the drone itself is beeping in the manner you heard in the video.

If it is obvious that I have re-assembled the drone incorrectly, it is my first assumption, but after having perused what resources I've been able to find after about an hour of googling, there's no indication of where specifically my reassembly may have gone wrong. If the arms are hard-coded to the drone, that's the first stop. I replaced the 2 broken arms directly with arms from a donor drone bought on e-bay.

Please note, I am not a "newbie," just new to drones. My background is in manufacturing, most recently as a Quality Engineer, and I got my start with that job title at a PCB manufacturer working on plenty of things you all would love to hear about, most of which you don't have the clearance to hear about. Replacing components up to and including BGA is not out of the question, but usually when you've gotten as far as the equipment in question booting up and chirping at you, either a particular component can simply be replaced or plugged in, or you're not understanding what it's trying to tell you.

Did I mess up from the start by replacing the broken arms with arms from another drone? If not, what is it telling me to do?
 
This is not a H Plus but normal Typhoon H (H480). The sound indicates a HW error. Check if all connections on the main board are tight, no pin is bent and all wires are OK. Maybe the GPS module is not plugged in correctly.

You can connect the Typhoon H to the PC GUI software to find the not working sensor. The best documentation for repairs and debugging is the WTFDprocect - a collection of documents here in the forum.
 
Did I mess up from the start by replacing the broken arms with arms from another drone? If not, what is it telling me to do?
Not at all. Each arm is either an A or a B. Check to ensure you have the right arm in each replaced location. But it does not matter for your problem. The drone can't fly with the wrong arms in place, but it will boot up just fine unless something else is wrong. Which is where you are.

"OBS not available" is pretty normal. It doesn't work until about 20 ft off the ground.

"First thing's first is a micro-usb cable, all of which I foolishly discarded from my kit"
As mentioned by @h-elsner, the LED flashing, the beep code and the Compass warning are the symptoms you would see if the GPS is not plugged in. It might be a good idea to check the GPS connection while waiting on a USB cable.

Also as mentioned by @h-elsner, the GUI will tell you a lot more, a lot faster, than anything else if the GPS module is in fact already plugged in correctly.
If needed, a couple of hints for GUI setup:
1.) You have to use a data capable USB cord. Standard USB charging cables do not work.
2.) You may need to set the file properties to "Run as administrator" and "Windows 7" compatibility.
3.) The GUI front screen mentions the possibilities of requiring additional USB driver(s). If your PC was built any time after Moses brought the 10 Commandments down from the mountain, you're probably already good.
4.) I think the GUI only comes in Windows version, but maybe some Macs can run it? (@DoomMeister will know the real story).
4.) The instructions for connecting the GUI are on the first screen.
6.) The latest GUI version can be downloaded from:
 
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