How To Fix Flight Controller NOT POWERING ON // Repair Video

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[@alexoliver9201]

This type of video is next level for the community! Fantastic content 🙏🏻 more like this please 😁

[@KrotowX]

Amen!

[@ibrahimalrabiah1179]

Again comeback to same video and saved it for future purpose, what a such amazing video . Thank you again .. and again.. and again

[@sidewinderam9m]

This video is awesome! I struggle so much to identify SMD components on FC's so that I can replace them. This is really helpful. I would love more of these, or even just an SMD component review on several different flight controllers and how to find replacement parts online. I am going to go watch all of your repair/SMD-educational videos to see if you already have that but thanks again.

[@Asu01]

This video came up just in the right time. How convenient..

[@du4-fpv777]

I have a feeling that this video alone will go to the highest views and fix hundreds of flight controllers out there. I have a few myself.... Thanks man! For making my wish to come true finally?

[@christiannorwik]

Dufour- FPV 🤞

[@KrotowX]

I only hope that new brave reapairman will not short their devices in rush and damage something else.

[@du4-fpv777]

What can I do if my 3.3v is shorted out? Helio aio fc

[@Dec1duousTree]

This was a really good one. Thanks. Appreciate it. You need to make more high level content like this. Thanks again.

[@CougarDude69]

Keep doing these videos, the hobby needs people like you to help folks really understand it. I had this problem with a flight controller. Could have fixed it!

[@derrickmitchell39dm]

I am in high support of vids like this because this hobby can be a money pit. I can't tell you how many FCs I have thrown out because I thought I completely ruined it, really good FCs worth 45.00 dollars or more. Thanks bro, this is good stuff.

[@jackwritter1302]

Love this guy, man.

[@MegaVape1]

Excellent video. I have 3 of these FC's, they are rock solid. But good to know if one ever fails.

[@Navinajr]

Dude... I just bypassed a failed diode on my speedybee f7 because of this video and it works!

[@fernandobaroni1497]

This video is inspiring, thanks so much! I have a broken board and I'll be troubleshooting it tomorrow after your video.

[@MCsCreations]

Fantastic work, dude! Really, really nice to know that! 😃

[@markberenbrok627]

enjoying your content. keep it up

[@pkeaton1]

Great info, Thanks for posting.

[@dronemania23]

Great, great video I learn a lot. Thank you. My question is what if I have sort between 3,3 and ground that means the FC is gone?

[@crispinodell519]

You're the man brother great work I hope someday to meet you

[@TheFlyingMechanic]

Awesome video man.

[@507fasfpv2]

This is some of the best content since Blue Falcon.

[@benmaynard3059]

true . RIP

[@Labyrnthdom]

Very cool video.

[@paulo.serrao]

@Drone Mesh do you plan on releasing a video on how to fix a short on the 3.3v reg?

[@flyoran]

Thank you very much for this matter

[@jlarson42]

Very helpful tutorial.

[@calisti9308]

Thank you so much!

[@NengsCreationsUSA]

Great video, thanks for sharing and may God bless

[@hometimesuccess]

Thank for the education you are the best

[@Kettenhund75]

Greetings! Thank you so much for explaining the power systems on these little FC's. Is there anything you can do if there is a direct short in the 3.3v regulator? My 3.3v and ground pads are shorted together on a GEPRC F4 20a v2.2. Thanks!

[@ianwillats5110]

Love your work. Hopefully I can try find the issue of one of my dead boards👍

[@DroneMesh]

if you never find them you can also donate them for me to find them ;)

[@bendalton5551]

well worth a follow comment and like. sick content.

[@iainjack9249]

Hey! Thanks so much for this, very helpful. Please may I ask for some advice though re an Omnibus F4 with VBAT input. I have an old one I want to use with INAV for an old plane and realised VBAT is dead so it's the opposite from what you show here. I followed the principles though and soldered a wire to the VBAT input and toned out the 2 diodes. No continuity beep. Also tried it on the 5v in pad and the same result. Does this mean the diodes are fine? Not sure what to try now. I can always grab a 5v board but, would like to learn how to fix this common fault.

[@redeemed1228]

Please keep doing vids like these. This is huge for the community I can’t stress it enough or how important it is and really makes your channel stand out above the rest. Thank u

[@mikeyben-chetrit4303]

Hey this video was extremely helpful! Can I just take out the diode and solder the top leg to one of the bottom legs? Is that what brigdeing them means?

[@abc121xyz]

awesome!! what about cameras that dont power up? do you have any tip? usually mines died after a crash but no external damage so could it be the crystal? or maybe other stuff?

[@shaharmaximuk9105]

Thanks - helpfull!

[@dwpetty3723]

Great tips, Great content, a little soldering, that fc will be back to new.

[@f0xvibes]

Thanks for the video. Unfortunately it looks that in my case, replacement with a KL3 didn't work. Seems like i need the 1AM (MMBT3904) does this sounds logic for you? Originally there was a 1AM diode on my F4 Pro...

[@b.w.oostdam8875]

Hello Drone Mesh, I have started repairing due to your very very good videos. I repaired 1 4in1 already and switched out a F405 on a CL racing F4 that now is now fully functional again!! very happy with that !. However ont the topic of Schottky diodes. After some searching on the internet for the correct component I found that people have great succes with this type: BAT54C . However this is rated for 30Volts. Is that actually the correct one to use (I do understand the different types but it seems the correct working type, but the voltage me worries me.) Thank you very much in advance for all te advice you can give.

[@Steady_FPV]

Awesome video, I would love to see a video which adresses the problem with a short on the 3.3v rail you talked about in the end ;)

[@ivantran3420]

yeah pleaseee

[@ivantran3420]

btw did you figure it out?

[@rob3393]

I checked your first step and the 3v3 pad shorts with ground and mine doesn’t power up.

[@billdor121]

Good timing on this release, my buddy and I were just working on his last night. It's doing the opposite thing, gets power from USB, but not the onboard 5v. So this might be the solution

[@12kokikoki]

Hi! Did you sort out your problem? I have the same issue.

[@jappiemoto]

I have a short to the 5 volt and a pad were you connect one of the esc signal wires what should i do?

[@awaitingthetrumpetcall4529]

I've been watching a few of your videos and only just discovered that I was not subscribed...corrected.

[@waynesworld8930]

yes keep up the great work truely great work your doin ill b intouch soon about donation an pateron for sure!

[@TechTimeElectronics]

I have two Fettec f7s that I'm going to diagnose hopefully, and see if I can't get them working again. It has the dim green light on and won't connect to betaflight..

[@TobermoryCat]

Helpful vid. With cameras costing £30 a pop, it might also be popular to ( if its possible) do fixes if they've been fried by reversing polarity. I'm betting there are a few fried cameras out there'n who hasn't fried a camera at some stage?

[@ttssproductionshorizon21fp88]

hey I got a question. if you don't want to answer its okj. but I def had 2 wires touch I heard the noise and now want light up connect to betaflight but I have my vtx run through the board for osd and that still works when a bat is plugged in,. is itg cause im use the vbat pad on the flight controller, or is it a sign my brand new succex f4 is not jun k

[@dndon2007]

great video.. btw.. I have old foxeer hs1177 I power it directly by 4s lipo then dead is there anyway to fix it.. thanks

[@diggsit69]

Hi, have a problem I tried to upgrade the VTX on my Tinyhawk 2 Freestyle an it smoke a little an stoped the TH FC from Powering up. Can you tell me where on that all in one TH FC would have burned out an how to Fix it? Any Help would be great! 🙏

[@batangak-kaw6744]

5v and ground is shorted in my mamba stack FC and it's powering up on lipo, in usb its also powering up but 2 led are not lighting. What do you think is the best way to fix it?

[@KrotowX]

Very very nice that you picked up this topic. For guys without fear from soldering this may become a tutorial. Because sometimes fix is certainly easy and you may avoid to purchase another flight controller that does cost 20 times more than fried diode. I hope that you can demonstrate soldering of SMD niceties too ;)

[@DroneMesh]

will do

[@KrotowX]

@@DroneMesh I said already that I have 2 faulty Racerstar TattooF4S FCs on bench. Both have 5V BEC ceased to work (novelty switching chips for 3A current appeared weak) after hard crashes so I added external 5V BEC board to go around onboard BEC :) After last hard crash in begin of November one of these boards died completely now having 5V rail shorted to ground. I'm curious what happened now. I'll will look on that later. Now there are snow and -11C outside, nothing to do with big boys. Got a pair of Mobula7 in yesterday so winter is set :)

[@jericolinetto]

hello drone mesh,got a question for you,my f405ctr only lit up when i plugged the usb,not when i power it up from a lipos,any ideas or link??? many thanks

[@Ivan-sw1uz]

Hello. Matek F405-CTR. Regulator 3.3 is hot. I raised it. The pad 3.3 V is short to the ground. What to do? You talked about some resistors or capacitors .. It is a pity to solder the controller and accelerometer.

[@IanF-FPV]

DM you are the man!!!! About to go home and fix my damn Mamba Mini F405...only boots with USB..I shorted the pig tail from the buzzer positive to a cap on the esc.

[@DroneMesh]

You could of burnt the 5V also keep that in mind.

[@IanF-FPV]

@@DroneMesh where is the 5v reg located on this board again? Could I replace with one from another FC?

[@IanF-FPV]

Follow up DM..I took everything apart and power up the quad with a battery...works find however my OSD is not working. I noticed the chip getting hot too. I used my hot air iron and removed the OSD but I didn't have the exact same model number. Decided to try anyways. Now I get a gray screen on the goggles when I power up the quad. Was worth a try. Know where I can get an AT7456E ?

[@GarengPetruk]

hello bro, I have a Speedybeey F405 V3. Previously I checked the 4V5 voltage with Ground which was fine. and the flight controller turns on. However, when I connected the camera and VTX cables, I accompanied this by attaching the ESC and flight control. then I checked using a 6s battery, suddenly the flight controller LED light didn't turn on. and I tried disconnecting the flight controller and connecting it to the battery so that the ESC turned on and made a sound. then after I checked the 4V5 voltage and ground, a beep beep sound came out. Does my FC have a short circuit?

[@kickfliph]

Hello there, I'm sorry for asking something that maybe not be fully related to the topic of this video. I just purchased a speedy Bee F4 V2 stack and the ESC motor No.4 is not working. I have installed 2 proven motors in the ESC No. 4 and none of them are spinning. I have done several tests like voltage o signal and nothing is going out of the ESC No.4. I went to the motor menu and try to make it spin but nothing is working for it, for all others 3 are spinning correctly when I start them to check the spin direction. I'm out of options here is there anything else I can do? Please let me know I will be more than happy to receive your feedback. Thanks for all your help. Regards,

[@NOIZYB]

so were do i send parts to or what is proper way to go about sending you electronics

[@MERCURYMAD]

So if we check the 3.3 v with a ground and it shorts IDK what to do from there

[@prozay6856]

I have a short in the 3.3v regulator. And the 3.3v regulator gots hot to the touch, is it repairable if I purchase a new 3.3v regulator, or is it no use in repairing

[@snotsworld]

Hi, any opinion as I have no idea basically an f7 flight controller and out of the box wouldn't power. I tired your tests and find their is continuity Grom ground to 3v3. I have no idea what that means or how I could solve it. Please let me know if this is dead.

[@mimarfpv]

i have a different issue with 5v reg. Fc mamba f405 mk2. Fc working correctly with usb port and battery power. But 5v pads on fc and osd doesn't working. When i check voltage on 5v pads i read something like 0.25 v on multimeter. I can still use fc but i want to see osd. I have a 5v bec. So can i fried fc if i connect 5v bec to 5v pads? (at the same time fc powered from battery)

[@MrEidroeg]

I seem to get continuity from 5v to 2 of these. how do I know which one is correct? batt wont power magnum board but usb will. help plz cheers

[@manuelhelbling8727]

Is there a way to fix a burned micro controll unit I think its this on my fc as theres like a burned blob on it , I it powered up but only get green light and the next day it hardly lights up and only a sec orvery dim at the beginning. If its the micro controll unit is there an easy fix to it ? Thanks in advance

[@CMDRTurtle]

I'm getting a short between my 3.3 volt and ground any idea what it could be?

[@olavverhoef7656]

Makes me wonder if I have a similar issue with my DALRC F405 AIO? When powering from Lipo no OSD. When first powering from USB, then connecting LiPo, everything works okay. Can then disconnect USB and fly without any problems...

[@kiwifpv5865]

Hi, great video...I happen to have the opposite from you..my Mamba F405 MK2 powers on with a solid red light on USB, but no connection to the PC. When I touch the 5V from the USB and the 5V in like you I can hear the ding from Windows detecting a new hardware. When I plug in the battery I can see a green light, and I get an image via the vTx and camera but no OSD. The F405 Chip also seems to get quite hot. Not 100% sure, but I think this FC only has one diode on the bottom side. Any suggestions are very welcome..:) Cheers KiwiFPV

[@g3orgeK.]

so my 3v3 has continuity with the ground. Any way to fix this?

[@spencerbryan8784]

I have the x220 wizard I am getting 1,45v everywhere to ground any thoughts

[@SOLARFPV]

Great stuff! I think I found out what is wrong with my old EO11 FC, by watching this. The leds dimm after I connect power and I can not bind to it. I changed the diode but I think I used the wrong type. Is there a way to figure that out without having a diagram of the pdb? Maybe I used the wrong diode or even a mosfet, or is a mosfet just a type of diode? Thank you for this great video, I just learned something new, again, and found out about some features of my multimeter I haven't used so much.

[@DroneMesh]

Dim led is usually a short on 3.3v

[@johnmcdonald751]

Im not sure what they are called and im not sure how to send u a oic of what the chip on the fc is please advise ty?

[@grumpyjohntxredneckrc6346]

Ok I have some dumb questions? I have a couple boards w/broken bind buttons, that won't boot, where can you buy some new ones to solder on? Plus they may be different sizes?? On Horizon Spectrum Crap Quads, Planes, Etc... 2) I also want to mod a couple slider pots onto the back of a TX to wire in conjunction w/the 2- turning pots on radio face, so I can use either/or for like pan/tilt cam mounts, wing tilts, etc!? Where can you get them at???Thanks

[@SOLARFPV]

Grumpy John TX Redneck RC - you can get all those tiny electronic parts from banggood or even on wish. Drone Mesh showed some sample booklets of components you can buy on banggood. They are reference books with samples of the different sizes/clases, like, resistor samples, diodes and so on. But you should also be able to get them in packs of 25 or 50. All you need to know is the size and the name or number of the component. Most microelectronic parts have a number printed on them, but you need a magnifying glass/microscope to read them. Hope this helps, and good luck shopping ;-)

[@istvansoos1055]

Dear Drone Mash! I have Hobbywing G3 F4 Fc. It does not power on. No usb, no battery. I measured the diodes, all the 3 has the the left leg short to 3.3 V NOT to 5V. Is it normal? Without battery the 3.3V and gnd is shorted. I know that it is not a good sign... When I give power to the board from battery, on the 3.3V pin I can measure 0.41V and a part with 5 legs 2 on one side, 3 on the other side is very hot. It has short to gnd on the middle pin on the 3 leg side and one leg on the 2 leg side. What to do? THX!!!

[@kiwifpv5865]

Great content..would this work for a Mamba F405 MK2 full board too? I also have another Mamba that powers on via USB but not via LiPo - no 5V output on any pads when connected. Which chip would you recommend to change or can it all be by-passed with a micro BEC (like the Matek one) connected to the 5V pads? Thanks

[@eagle7015]

If u got any answer on how to Bypass with bec pls say

[@imsid2253]

Did you solve your problem?

[@kiwifpv5865]

Unfortunately never got it to work so got a new one

[@imsid2253]

@@kiwifpv5865 no worries man. Mine literally came out of the dead a few hours ago. Trust me more often than not, nothing is burnt. It’s usually a short and apparently when I connected the battery even tho I knew it was a short, everything powered on and the there was no short anywhere on the board anymore!

[@karthiprem]

Hi I encountered an issue with my fc and would be great is you could help me out First my esc that was connected has a motor out of sync Then the 3rd motor was not making any beeps on boot up Then i reflashed the firmware and wasn’t able to do anything with it My fc right now has 2leds on, one for power abs the blue boot led after which she sw led comes on Could you help me out please

[@armandoortizlira6552]

Hello bro, is beautiful your videos!, bro I have a problem whit the fc, the problem that I have is that all works correctly but the voltage in in betta flight always put 0v and when I conect the lipo is the same, always put 0v, when I disconnect of betta flight I can turn on the fc with the lipo, the gyro works fine only the problem.is that always say 0v have any idea of the problem bro? Can you help me please?

[@kushangsolanki999]

My fc isnt giving the last 2 beeps when i plug in just the battery, whut then i plug the usb and the battery , there were all the beeps. I saw your video, the 5v pad and diode part is showing continuity what shall be done ? Please help

[@pacnsave1]

I replaced the diode on my dalrcf405 aio, it works on USB but the LEDs are very dim and the receiver doesn't turn on is it maybe the wrong diode type?

[@akowalo]

Hi. Nice video. I got A question. What to look for when i plug USB and i got A dim red led on mamba f405 mk2 mini. THX

[@Tiber_FPV]

stesso problema, hai risolto in qualche modo? grazie

[@CarbonGlassMan]

Now I have the opposite problem. I just wanted to reset my gyro in my 5 inch quad because angle mode made it pitch back and roll left about 5 degrees when you don't touch the sticks. I plugged into USB and got nothing. But if I also plug a battery in, Betaflight connects. I must have blown the schottky diode. I'll have to take the quad apart to test it I guess.

[@derrickmitchell39dm]

I got a omnibus f4 v5 with dom LEDs. Where do I send it?

[@CarbonGlassMan]

I've got one that doesn't power on with a battery. It powers on only when the USB is plugged in and will spin the motors when a battery is plugged in while the USB is also plugged in. It's a brand new AIO TH2 board.

[@bengs2x]

mine is piko blx, when the usb connect the fc is on and betaflight detect it, but when the battery plugged, theres no power at all, the led is just off no power at all...is it a problem with diode too? or is just a bad fc and just throw it away....

[@saralapati6791]

Bro what is that two silver brick type thing which says 100 ? When I connect my board that thing is getting hot

[@yinonshelach31]

hi my friend what can i do if the graund and the 3.3v Beeping when i check ? and the usb not conect

[@beatabortel7680]

good to know :)

[@jappiemoto]

Mine works when i plug it in with usb led’s two. but not with my battery it had a short what can i do?

[@NOIZYB]

lol i think i blew the stmf7 chip itself could i just put another chip on it actually runs same target

[@catalinilea]

Got a beep between 3.3v and ground. What should I check next?

[@Steven-er2od]

on my wizard the biggest chip on the Fc gets hot and there are no lights burning what is then the problem? i happend when i soldered a camera on it

[@gregorydahl]

Mine has a bad internal voltage regulator . Camera , rx , vtx , led pads , buzzer all dead .i think a red wire came off a camera and shorted or the whole thing heated from 2 battery flights and struck a branch. It all went black but had osd and vtx until i started wiggling it around trying to see if it was a loose plug . New flight controller is bigger and nicer . It has 5v and 10 v for vtx and i guess a 3.3v too inside the flight controller . Voltage regulators are 50 cents and fc are $50 . Don't overload your fc's voltage regulator with accessories.

[@bayuubay1001]

I did a mistake 🤦 I forgot to attach the antenna before turning on the radio. I turn the radio on without antenna for approximately 3-5 minutes. I just started learning fpv and want to practice on the simulator. So I don't have any quad yet right now. How to check if my radio is still working before I buy a new quad?

[@micardo9491]

Hello i have a 25mw fpv camera which include a transmitter and this thing overheat and the lens dissolves.

Hi. Yesterday my quad died on the ground. no lights on FC (from batt and usb) but 5V is good because RC receiver and VTX work. 3V3 regulator or CPU? Thanks.

[@brendanvanbiljon3861]

Did you figure it out?

[@RafyelBrooks]

Great info bro! I have a few FlightOne MillivoltOSD flight controllers and have now verified that the 3.3v regulator is fried. How do i find where it is to replace it?

[@DroneMesh]

Never seen one... Would you like to donate one for a fix video?

[@RafyelBrooks]

@@DroneMesh Sure. Where to send to? Also, i double checked and the 3.3v is fine, just cant find the diod for the usb 5v.

[@tyronepullan6624]

hey man, i got my mamba f405 and vcc and gnd has continuity. there's no visible short. nothing gets hot. any thoughts? thanks!!

[@tyronepullan6624]

also, my matek 6s pdb the 5v regulator is burnt, can i still use it to power my quad (thru vcc)?

[@NoteKeys]

What does the 3.3v regulator look like?

[@neonoir__]

Great, how do I swap it though?

[@yaronskp]

I have a flight controller that powered from the USB but not from the battery. My question is - How do you replace the 5v regulator on the board?

[@kanenstuff]

Hi i had a motolab temptest and its a tight build i had to re-bind my xm+ after updating betaflight. I shorted out my unify in the process installed another and burnt it out also. How could I test my fc to see if theres a problem there now any info would be great.

[@prrcpor]

sounds like your pumpin too many volts in it . is it a 5v vtx? if so get a multimeter and check DC volts on your 5v regulator output. if its bad it will show VBATT and not the stepdown voltage .

[@kanenstuff]

@@prrcpor the quad quad was perfect until i updated to 3.5 now its just destroyed 2 unifys think its better just to start fresh just keep frame motors thanks for your reply

[@gorace71]

Could you show the process of replacing the bad part? Thanks meshman

[@DroneMesh]

Sure

[@priyanshuroy1119]

In my betaflight f4 while doing continuity test my 3.3 v and ground are continued which means my 3.3 v regulator is burned up . So what can I do next to revive it again. Please help.

[@kwadlife4106]

Should check out livyo

[@riccardosalis7643]

How did you solve? I'm facing the same problem. Ground and 3.3V have shortcut and the fc doesn't turn on.

[@yinonshelach31]

i have the same problem . on my f7 what can i do ?

@@kwadlife4106 Livyo? What is it? KZbin channel? Thanks

I get it.

[@lucan3361]

Whenever I plug in my flight controller with USB or from a lipo, it just heats up with no sign of life. I did smoke it once. do you know what the problem could be?

[@tyannp6999]

I have a problem ... the battery is not detected in Betaflight ... what should I replace