Hi there!
My brand new APM2.5 died before even mounted on my quad. The problem is similar to hundreds of users across internet - when connected to computer via USB, only solid green led comes up, and board cannot connect to Mission Planner (it ether gets timeout, or hangs during "got param" phase).
Similar to other users, I can freely install firmware and use terminal. When I launch test via terminal, I get "Panic: failed to boot MPU6000 5 times" error. This is the same reason the board doesn't boot - it fails upon self-test on sensors.
I've done some research and it seems that problem is not in the MPU-6000 itself, but with the small 3.3V voltage regulator near GPS connector. Lot of users have stuck with this problem and it turns out that regulator is dead - gives out too much or too little power. I've already ordered replacement regulator and I will resolder it as soon as it arrives. BUT - I'd like to know what caused regulator to die (as I mentioned - I haven't even installed APM board on my quad - was just playing with it on desk), and, most importantly, how to make sure that it doesn't die in mid-flight next time? Maybe I should go with another option for my FC instead of unrealible APM2.5?
Replies
I have had similar problem and I have replace TPS 79633 regulator with TPS 73633. So far it it working fine on ground, have not made any flight with that.