# Need your help to diagnose the crash

**URL:** <https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637>\
**Category:** Flight Testing & Log Analysis\
**Created:** [August 26, 2019, 7:13am UTC](https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637 "2019-08-26T07:13:07Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![joewang41](https://discuss.px4.io/letter_avatar_proxy/v4/letter/j/ce7236/32.png) [@joewang41](https://discuss.px4.io/u/joewang41)\
**Post date:** [August 26, 2019, 7:13am UTC](https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637/1 "2019-08-26T07:13:07Z")

</div>

Hello Guys,

drone ran in manual mode, then I used QGC switched to orbit mode. It was working fine initially, after a period of time it suddenly crash. need your help to diagnose. thank you!

frame H380  
controller pixhawk4 / M8N  
telemetry 3DR v1.9  
motor 2212/1400kv  
ESC blheli 35A

link for crash log  
[https://logs.px4.io/plot\_app?log=85562b85-4847-4a29-8791-6a2ed820fa11](https://logs.px4.io/plot_app?log=85562b85-4847-4a29-8791-6a2ed820fa11)

---

<div class="post-metadata">

**Author:** ![JulianOes](https://discuss.px4.io/user_avatar/discuss.px4.io/julianoes/32/30_2.png) [@JulianOes](https://discuss.px4.io/u/JulianOes)\
**Post date:** [August 27, 2019, 2:32pm UTC](https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637/2 "2019-08-27T14:32:17Z")

</div>

Sorry to hear about your crash.

From the log it looks like that at time 3:43.200 presumably some ESC/motor/propeller(s) failed and it could not correct attitude and altitude anymore with only 3 outputs.

Does that match what you observed or found later? Can you do a test if fall motors still work?

---

<div class="post-metadata">

**Author:** ![joewang41](https://discuss.px4.io/letter_avatar_proxy/v4/letter/j/ce7236/32.png) [@joewang41](https://discuss.px4.io/u/joewang41)\
**Post date:** [August 28, 2019, 2:11pm UTC](https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637/3 "2019-08-28T14:11:12Z")

</div>

Hi Julian,

Thanks for the input.

Yes, found a wire was disconnected between motor and ESC. I soldered to connect each other after came back home, but I can’t make sure which motor was, should be either motor 2 or motor 3.

motor 3 motor 1

```
     pixhawk ^ (^ means direction)

```

motor 2 motor 4

---

<div class="post-metadata">

**Author:** ![joaolmarins](https://discuss.px4.io/letter_avatar_proxy/v4/letter/j/958977/32.png) [@joaolmarins](https://discuss.px4.io/u/joaolmarins)\
**Post date:** [September 2, 2019, 5:42pm UTC](https://discuss.px4.io/t/need-your-help-to-diagnose-the-crash/12637/4 "2019-09-02T17:42:45Z")

</div>

Hi. Do you have a log of that flight (.bin file)? I’m running a program in my Doctor’s Thesis and it will be very useful. My e-mail is [joaolmarins@gmail.com](mailto:joaolmarins@gmail.com)  
If you have other files of good flights i’ll also appreciatte.  
Thanks.