There are three more possibilities, but two of them require "micro soldering" on the main board. Unfortunately, those two problems often show up after a crash, because they involve cracked solder joints.
The next reasonable possibility is to change out the altimeter sensor. The altimeter is part of the GPS module sitting on top of the battery box (on a standard QX3). Can you borrow the entire GPS module from the good drone and try it on the problem child? Before you take the good drone apart, you might want to take a hard look at the wires and connector associated with the GPS module of the problem drone. The end of the wires at the GPS are soldered on, and covered with some sealant. You have to tug on each wire to ensure it is still soldered. The sealant holds it in place even if the solder is broken loose.
Updated 07:09PM - The blue and orange wires are the most likely to affect altimeter function.
The next reasonable possibility is to change out the altimeter sensor. The altimeter is part of the GPS module sitting on top of the battery box (on a standard QX3). Can you borrow the entire GPS module from the good drone and try it on the problem child? Before you take the good drone apart, you might want to take a hard look at the wires and connector associated with the GPS module of the problem drone. The end of the wires at the GPS are soldered on, and covered with some sealant. You have to tug on each wire to ensure it is still soldered. The sealant holds it in place even if the solder is broken loose.
Updated 07:09PM - The blue and orange wires are the most likely to affect altimeter function.
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. So, if I don't break anything else over the week end, I'll have some time to work on it all. Thanks for all the help and advice from all of you, it's been extremely helpful.
