Lost live chat.. They Gyro CS pin is connected to MCU with a pullup resistor. It's always worth checking it. You can find out in the firmware source code of your FC
True but that is easily spotted visually. But most of the time I found the gyros fail from mechanical stress (hard crash) but yeah, of course, the first thing is to visually inspect the PCB and check if parts are missing or broken.
@@LivyuFPV I was just noting it to emphasize on the visual inspection as that resistor could of popped off the board.. None the less great work..Have been watching you for a while now.
Great video. My TH2 board is dead with just a battery but a battery and USB will give me battery power to my motors. Somehow the battery voltage can get to the rest of the board as long as the USB is also plugged in. Without the USB plugged in, the board is dead.
Great explanation! Thank you. But, I have a problem, my Flight controller doesn't turn on with my USB or Lipo battery, and VTX and receiver work perfectly. I still don't know why this is and your diagram helped me a lot understanding the problem yet I still don't know the answer to it.
Thanks for the video, I connected a servo to my receiver and rotated the servo shaft which generated around 2-3 volts and then my FC was shut. I was unable to turn it on and could you please suggest me what to do?
So my sbus signal stopped working. My goal is to check for continuity between the receiver and the pin in the MCU. Two questions: does this approach makes any sense? How can I find out which is the sbus pin on the MCU? Great video! You seem to be somebody who knows what you're talking about and probably could answer my questions. Subscribed!
HI, well i would check out the betaflight specific firmware for that flight controller and will show you a hint of that pin. Yes check the receiver first and after that if the receiver sbus pin has connection to the pin (or if there is any other component in between) and come back and tell us the results :)
can i use you help? i have a fried crazybee f4 aio. main battery leads are shorted but when plugging it by usb everything works. how would you troubleshoot this without desoldering most of the components? ive tried to identify voltage regulators but could not find any relevant result in google by just the markings on them.
Another superb video! you just gained a new subscriber :) so this may be a stupid question, but where does voltage sensing of the lipo come into play? and things like current readings over a shunt on an aio fc? I have an aio fc where both stopped working (current readings first, a few weeks later voltage also read 0). apart of this the fc works just fine. I just cant seem to find an answer to this, does anyone here know?
Well current is nothing more than reading with a multimeter the voltage drop on the shunt. (the fc reads the value between entry point and exit point of the shunt. The voltage sensing is a resistor network that attenuates the voltage down to like 2v and the mcu reads that and corelates it to the lipo voltage. And thats why in most fc s out there you have a correction factor to both the current and voltage sensing.
Guy I have problem betaflight voltage reading 10V from usb with any lipo connected . also reading that i have 3s battery plugged in, again no battery is plugged in just usb?? Mamaba F722 mk3
I have 2 receiver boards WJ-XS809RX(QYJ) of the drone VISUO XS809HW. On the input capacity there is 3.8V. and on the output capacity there is 2.02V. I think the transistor is defect it is a SMD with 3 connections en the description on the transistor is 54PH on the second board the description is 54QE. When i connect 3.3V. on the + point on the board it is binding . The second board give short but on the input capacity there is 3.8V. and on the output capacity there is 0.0V. I find not a scheme on the internet and not the smd 54PH or the 54QE. for replace on the internet there are many pictures of the WJ-XS809RX(QYJ) board. Someone the scheme of the board with the description of the components or the just description of the transistor. On the other place of the board there is also a transistor ML5 someone the just description? Thanks Marc.
Hello, i crashed my quad and the antena came off the vtx. I decided to solder and when removing the vtx I ripped off the plastic connector for (video, ground,Rx,5v).i did a horrible solder job and when power on drone little smoke came out and led lights are not working anymore . I ordered a new vtx .ordered the same one I had and just plugged everything in but vtx not turning on or the FC not recognizing it . Everything else seems to work .motors and everything. But not the lights not vtx. Could the FC be fry just in one part or when it does it does completely and nothing works . Please any answers will help .I'm struggling .
Do you use bec of fc to power vtx ? Or any other bec ? Do you power it by lipo pad on fc ? I see 2 things possible 1 burned bec or burned lipo trace :) go hunting :p
To further discuss the gyro topic I brought up... How can i be sure the gyro is faulty? I read in a forum that it could also be a transistor which controls the gyro power... Is there a way to measure whether gyro is receiving power?
as I talked in the video the gyro and mcu receive power from same regulator. so if the mcu is working the gyro should have power also. Check if no parts are missing and in the software gui if you see any movement.
Why do I have continuity between the input and output pads on a 5 pin 5v reg? Reg output will read what ever voltage I feed the board. Current draw is only 80ma, MCU was dead, 3.3 volt regulator is working but can't find continuity between 5v output and 3.3 input, don't want to install a working MCU till Is sorted out. Betafpv 12a aio
Great explanation. Subscribed. How about a 1s FC wich doesn't have a 5 v regulator nor a usb? Like the FC on toy drones? Wich is what I want to fix. Example the Eachine E011 brushed FC.
Amazing video. Thanks for this clear explanation that goes into detail without the need to have a PHD in elctronics engineering.
Very good! The things you said to check will likely find the problem 90% of the time. It is usually one of those. Thanks for the video.
Now I regret throwing away 3 of my dead FCs. Thanks for sharing this knowledge, its really useful.
Fantastic explanation of the basic diagramming of a flight controller!
wow thanks these tutorials are super useful in learning in-depth repairs. Thanks so much:)
hope to see in future you would list out part number of those common components on FC. Great video.
Please more videos when you have time. I want to learn from you. Thanks!
Really good learning material. keep going please
About time for a Livyu branded flight controller...... as The brows shift up and down and the hands rub together......
Lost live chat.. They Gyro CS pin is connected to MCU with a pullup resistor. It's always worth checking it. You can find out in the firmware source code of your FC
True but that is easily spotted visually. But most of the time I found the gyros fail from mechanical stress (hard crash) but yeah, of course, the first thing is to visually inspect the PCB and check if parts are missing or broken.
@@LivyuFPV I was just noting it to emphasize on the visual inspection as that resistor could of popped off the board.. None the less great work..Have been watching you for a while now.
@@DroneMesh I watch both your channels. Smart guys that really is important for our hobby!
I cant say how nice that Video is. Thank you so much you learn me fixing FPV Stuff :)
Thank you for the lesson 🙏🙏🙏
Thanks a lot to you, it was very helpful to my situation!
Great video. My TH2 board is dead with just a battery but a battery and USB will give me battery power to my motors. Somehow the battery voltage can get to the rest of the board as long as the USB is also plugged in. Without the USB plugged in, the board is dead.
Really helpful! 🔥
Great tutorials! 🙏🙏🙏
Well Done. Took some “complacoious” out of the subject
Thx Subscribed.
Thank you. This answered a lot of questions I had.
Do people attempt to repair the FC? I would have thought people replaced the FC.
Great tutorial
Great explanation! Thank you. But, I have a problem, my Flight controller doesn't turn on with my USB or Lipo battery, and VTX and receiver work perfectly. I still don't know why this is and your diagram helped me a lot understanding the problem yet I still don't know the answer to it.
Did you figure it out?
Thanks for the video, I connected a servo to my receiver and rotated the servo shaft which generated around 2-3 volts and then my FC was shut. I was unable to turn it on and could you please suggest me what to do?
awesome so much info!
So my sbus signal stopped working. My goal is to check for continuity between the receiver and the pin in the MCU. Two questions: does this approach makes any sense?
How can I find out which is the sbus pin on the MCU?
Great video! You seem to be somebody who knows what you're talking about and probably could answer my questions. Subscribed!
HI, well i would check out the betaflight specific firmware for that flight controller and will show you a hint of that pin. Yes check the receiver first and after that if the receiver sbus pin has connection to the pin (or if there is any other component in between) and come back and tell us the results :)
Nice video, like always, thanks!
Damn. My 3.3v regulator was getting super hot. Probably blew the MCU.
what LDO can you recommend for 4-6s to 5V? i burned my main 5v ldo, but it has no labels. should be a sot23-3
Hi is this also has a same working principle as F405Wing?
can i use you help? i have a fried crazybee f4 aio. main battery leads are shorted but when plugging it by usb everything works. how would you troubleshoot this without desoldering most of the components? ive tried to identify voltage regulators but could not find any relevant result in google by just the markings on them.
T es un dieu mega merci !!
this is GOLD
Another superb video! you just gained a new subscriber :) so this may be a stupid question, but where does voltage sensing of the lipo come into play? and things like current readings over a shunt on an aio fc? I have an aio fc where both stopped working (current readings first, a few weeks later voltage also read 0). apart of this the fc works just fine. I just cant seem to find an answer to this, does anyone here know?
Well current is nothing more than reading with a multimeter the voltage drop on the shunt. (the fc reads the value between entry point and exit point of the shunt. The voltage sensing is a resistor network that attenuates the voltage down to like 2v and the mcu reads that and corelates it to the lipo voltage. And thats why in most fc s out there you have a correction factor to both the current and voltage sensing.
@@LivyuFPV Thanks a ton! I'll be following those traces and see if there's damage somewhere!
If I want to check and see if my 5v regulator is working what pads do I touch with my multimeter/voltmeter?
Guy I have problem betaflight voltage reading 10V from usb with any lipo connected . also reading that i have 3s battery plugged in, again no battery is plugged in just usb?? Mamaba F722 mk3
I have 2 receiver boards WJ-XS809RX(QYJ) of the drone VISUO XS809HW. On the input capacity there is 3.8V. and on the output capacity there is 2.02V. I think the transistor is defect it is a SMD with 3 connections en the description on the transistor is 54PH on the second board the description is 54QE. When i connect 3.3V. on the + point on the board it is binding .
The second board give short but on the input capacity there is 3.8V. and on the output capacity there is 0.0V. I find not a scheme on the internet and not the smd 54PH or the 54QE.
for replace on the internet there are many pictures of the WJ-XS809RX(QYJ) board. Someone
the scheme of the board with the description of the components or the just description of the transistor. On the other place of the board there is also a transistor ML5 someone the just description? Thanks Marc.
Iam new to drones ... Can you help me in building new flight controller s with aurdino or stm32
Hello, i crashed my quad and the antena came off the vtx. I decided to solder and when removing the vtx I ripped off the plastic connector for (video, ground,Rx,5v).i did a horrible solder job and when power on drone little smoke came out and led lights are not working anymore . I ordered a new vtx .ordered the same one I had and just plugged everything in but vtx not turning on or the FC not recognizing it . Everything else seems to work .motors and everything. But not the lights not vtx. Could the FC be fry just in one part or when it does it does completely and nothing works . Please any answers will help .I'm struggling .
Do you use bec of fc to power vtx ? Or any other bec ? Do you power it by lipo pad on fc ? I see 2 things possible 1 burned bec or burned lipo trace :) go hunting :p
To further discuss the gyro topic I brought up... How can i be sure the gyro is faulty? I read in a forum that it could also be a transistor which controls the gyro power... Is there a way to measure whether gyro is receiving power?
as I talked in the video the gyro and mcu receive power from same regulator. so if the mcu is working the gyro should have power also. Check if no parts are missing and in the software gui if you see any movement.
@@LivyuFPV No parts are missing but no movement in gui... so I guess faulty gyro :-(
@@airexfpv1596 easy fix ;)
@@alexanderfedorov7890 Where can I buy gyros?
@@airexfpv1596 ebay, digikey, etc... i was using bangood 6 axis gyro boards as donors too ;)
Why do I have continuity between the input and output pads on a 5 pin 5v reg? Reg output will read what ever voltage I feed the board. Current draw is only 80ma, MCU was dead, 3.3 volt regulator is working but can't find continuity between 5v output and 3.3 input, don't want to install a working MCU till Is sorted out. Betafpv 12a aio
What about osd chip?
Great explanation. Subscribed. How about a 1s FC wich doesn't have a 5 v regulator nor a usb? Like the FC on toy drones? Wich is what I want to fix. Example the Eachine E011 brushed FC.