RC Fix: No power on flight controller when not connected to USB

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Happy flying!

[zaporniska]

I think that you saved me about 100 Pounds with your video =) I have few FC with built in PDB and I have similar problem. Eith your video I got the idea how to still use them. Good work, thank you!

[rl]

Thanks for posting this informational video! Your channel is VERY comprehensive!

[daviderovera]

my esk is a 4 in 1 so where do I get that cables?

[rusyaraiju]

can i connect directly to negative and positive battery terminal and not using the spare positive and negative battery terminal ?

[derrickmitchelldm]

Painless,

Forgive me if I am being difficult at understanding your video on this subject. I have a Omnibus f4 v5 and I got clean 5v power coming from my matek PDB and I am not getting any power to the FC. What am I doing wrong?

[CarbonGlassMan]

My new replacement Tinyhawk 2 AIO board worked find but the motors were spinning backwards. As I was trying to figure that out, it stopped powering on when I plugged a battery in. It only lit up if the USB was plugged in. If I then also plugged a battery in, it made the tones and I can spin the motors in the motors tab of Betaflight. Unplug the USE and leave the battery plugged in and it goes silent and dark. It's as if no battery is plugged in.

[crossfirefpv]

Hey buddy.can you please make a video on how to use qx7 on fpv freerider smartphone version..?

[TheJanis]

This just happened to me, but it was working earlier?, any ideas?

[alfaridzy]

Your Video is good looking, what camera you use for this Video?

[cswann]

Sorry for the big comment.... would my issue be caused by a bad FC power regulator? First flight of the day... I plugged my lipo in... NO LED lights on FC, only 3 fast esc beeps. I unplugged/re plugged the lipo a couple more times when I noticed the red LED started to slowly come on from a dim red light to eventually full brightness, and then after several more unplug/re plugs of the lipo, pulling and shaking the quad...the red and green LED both came on as they should, with 3 fast esc beeps then 2 slower beeps, I was then able to arm and fly without further problems. Plugging other lipo's from this point on had no issues as well.
-Board powers up normally by USB power every time though. I have checked and resoldered all connections..even my main bat wire s to the board and XT60. After I did this, board powered up by lipo off the bat....but after a day or so the issue returned. Could pluging my lipo in while its connected to USB power, cause a regulator burnout? Help pls.
using a F4 board..clracingf4s...to be exact.

[owenknight]

Any chance of an eachine ev 100 review before the release date

[jappiemoto]

I had a short now the board only works when i plug in usb not via the battery help!

[sailorjohn]

Can 1 of the escs  detect low voltage before the other 3 and cause quad to flipover and crash ?

[MrSabram]

I'm playing with an old Omnibus F4 and I'd seem to have the opposite problem when I plug in USB alone I can't connect the beta flight but if I supply battery power then everything lights up and I can connect to beta flight. Now I'm supposed to be able to connect the beta flight without a battery, correct? And if that's the case what's going on here, thanks in advance for any help you can give me

[ThePbstar]

Hey, I was just wondering if you could help me out with a problem I’ve never had. I just purchased a new f3 femto flight controller for my flite test gremlin. The board worked perfectly fine I checked it on betaflight. When I plugged in the 2s lipo the board responded perfectly. When I went to do the motor calibration the X, Y, Z graph froze, and I couldn’t continue with the motor flash. So I disconnected the board and plugged it back in with the USB, the board did not respond, no LED sequence. The computer now says USB device not recognized, I tried 2 different USB cables and 2 different computers. It’s almost like the board isn’t being powered via USB. So I tried plugging in the 2s lipo, the board responded, but the red LED just continuously flashes. Any thoughts? Thanks for the help.

[RLEJ]

Very good explanation...Thanks... also, I am a little confused about one thing... If all ESC's have +5V BEC attached wire, and I only need one to power the FC, what do I do with the other 3 +5V leads? Do I remove them or will it not hurt if they are plugged into the FC?

[DangerDavefpv]

I have matek f405 CTR that turns on with USB but not lipo but the 5v pad shows voltage 5.05 to be exact

[caseyc]

Slightly off topic question but I've broken a couple of the 5 to 6 pin connectors (jst?) on my vtx and was wondering a recommended a way to solve this issue. After a crash or from unplugging/plugging over the course of time, they become loose and cause signal loss. I tried to solder wires directly to the tiny pads where the pins connect to the vtx, but they are so small and close to each other, I couldn't keep the solder from bridging. It seems like this would be a common problem but I can't really find a solution. Wondering what experience you have with vtx connectors. Thanks

[MrRampage]

Can you help with cc3d libre pilot issue...your videos helped me set up ...all works good while connected to computer. CC3d responds to radio and all arming and stick inputs, but once I unplug from computer and reboot everything it works until I try to arm when I go to arm then I loose all stick inputs, except flight mode switch I can flip from manual to attitude and it responds, but nothing else responds.

[dustinh.]

I have the same problem, but I am using an AIO F3 Brushed Controller. Any Chance I can fix this problem? When I am plugging in the battery, the power led is red and very faint, nothing else. With the USB Cable, everything works.