Pixhawk PC connection error

kadir_bay · August 6, 2021, 10:16am

Yes, I tried. Pixhawk doesn’t show up in device manager.

Dave84 · August 6, 2021, 11:20am

try qgroundcontrol and check if your fc its recognized by the system.
Please don’t post double topics.

kadir_bay · August 6, 2021, 1:15pm

Qgroundcontrol I’ve triedI’ve tried The problem was not fixed.PC doesn’t see pixhawk in device manager.

kadir_bay · August 6, 2021, 1:19pm

Why can’t I get a clear answer

copilot · August 6, 2021, 1:31pm

Do you have a power brick? maybe you could try to powering it separately so that it does not take any power from the PC and then see if it gets detected.

This is not the normal behaviour for these Pixhawks, so something must be strange in your case. Maybe you have a faulty unit. Have you tried on a different computer?

copilot · August 6, 2021, 1:36pm

Sounds similar?

Sounds like he could get it kind of working with a separate supply…

rickyg32 · August 6, 2021, 1:36pm

Have you tried a different cable. I have had issues with Cables not working on the Pixhawk. While it powers it, it won’t transfer data. So I replaced the USB cable.

kadir_baydemir · August 6, 2021, 2:00pm

I tried it on 3 separate USB cables. Cables are solid. Connection failed.I tried to feed the Pixhawk with the Power module and connect it via USB. The result is unsuccessful.

kadir_baydemir · August 6, 2021, 2:04pm

I suspect the Pixhawk’s 3.3 volt IC is faulty. What do you think will happen if I supply 3.3volts from the ABC 3.3V socket on the reverse?What do you think will happen if I supply 3.3volts from the ABC 3.3V socket on the reverse?🤷

copilot · August 6, 2021, 2:41pm

You mean on the ADC pins? Sounds a bit risky to me, as far as I know they go to the MCU. Maybe you can first measure the voltage on the SPKT/DSM pins. Looks like they should give 3.3V and I suppose if you measure 3.3V there then the regulator is fine.

copilot · August 6, 2021, 2:46pm

Just thinking about it again, since the MCU runs on 3.3V and seems to power up (lights start flashing etc.) I doubt that it’s the regulator.

kadir_baydemir · August 6, 2021, 2:50pm

I hope the problem is software. It’s risky to give voltage from the pin, so I didn’t try it.

kadir_baydemir · August 6, 2021, 2:52pm

There are two lg33 regulators on the Pixhawk board and I feel one of them getting hot. Maybe it’s a reasonable degree. I will measure the voltage with a voltmeter.

kadir_baydemir · August 6, 2021, 4:15pm

Windows 8 Is there a driver I need to install for it?

ktrussell · August 7, 2021, 9:27am

I don’t think you said if you have tried a different computer. That would be the most useful troubleshooting step at this point. Since you do not see the device even in device manager, just seeing if it shows up there on another computer would help rule out the cable and the Pixhawk hardware. You would not need to install any software or drivers on the other computer to see that. Just plug it in and see if it shows up in device manager.

kadir_bay · August 7, 2021, 6:19pm

two circuit elements that I noticed getting hot on the board. 3.3 volt regulator and zener diode. I changed the regulator amotherce. the problem persisted. I disassembled the faulty zener because I didn’t have the zener diot in my hand.W3 Dismantled. LG33 has changed. Now the pixhawk connects to the computer. The software is installed and there are no problems. Maybe the zener Diode is redundant.

🤷:sweat_smile:

kadir_bay · August 7, 2021, 6:20pm

Solution. Zener Diode failure causes overload to the 3.3 volt regulator and cuts off the power of the board. The problem seems to have been fixed once the Zener Diot was removed.

kadir_bay · August 7, 2021, 6:22pm

Front left corner of the card.

ktrussell · August 7, 2021, 6:57pm

Congratulations on the fix!

copilot · August 8, 2021, 8:35am

Very interesting and great fault finding work! Glad you got it running.