Order ##701494 - T Motor F7 - Motor 3 doesnt work

Help Unmanned Tech
1

Order Number: #701494
Product Name: T Motor F7
Brand: iFlight RC
Hi motor 3 connection doesnt work. Ive tried it with 2 new motors so the fault is on the board.
Can i exchange for new board please

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2

Hi Jason good day,

I’m sorry to hear you are battling with your AIO.

I have reached out to Tiger Motor and have asked for their assistance in navigating this for us. They are currently looking through the description and images which you have sent us.

As soon as I hear back from them I will let you know.

I will try and get a resolution to this as quickly as I can.

How would you rate our customer service?

Regards,
David

Unmanned Tech Support

3

Thank you David. I appreciate the update and speedy resolution as eager to fly the drone

4

Hi Jason good day,

I am still speaking with Tmotor regarding you AIO, they are concerned about the soldering of your board.

I am waiting on their response to some questions and will update you accordingly.

Regards,
David

Unmanned Tech Support

5

Good morning Jason,

I had a reply from Tmotor, Lillian has asked if you can make a short video showing the following:

The video content is: Use a multimeter to measure whether the three pads of the No. 3 motor are short-circuited to one of the positive and negative

The below guide will help you through the process if you are not familiar with the process of checking mosfets.

How to Check If Your ESC Is Broken: A Comprehensive Guide

Many FPV pilots have encountered a problem with their quadcopter motor/esc (Electronic Speed Controller) but don’t know how to check if their ESC is broken. This can be a severe problem, as a broken ESC can cause your quadcopter to malfunction and even catch fire. In this article, we’ll show you how to check if your ESC is broken and how you can repair and replace your MOSFETS.

What is a MOSFET?

In simple terms a MOSFET is basically just a switch, in context of an ESC, the job of the MOSFET is to switch the three phases of the brushless motor to make it spin.

Why Do ESCs Break?

All ESC used on drones and quadcopters to drive brushless motors use Metal-Oxide semiconductors (MOSFETs) in the speed controller. MOSFETS are actually one of the most widely produced component on the planet, and almost never fail out of the box. They only fail due to over current, overheating, or over voltage due to a crash/ bad installation or incorrect use outside the operating parameters. Most commonly is during a crash your motor can jam causing a spike in current and voltage that can cause a MOSFET to fail.

How Do I Know If My ESC (MOSFET) is Fried?### 1 - Inspect Visually

On some rare occasions a MOSFET may have been placed incorrectly during production and this would mean, and ESC is faulty out of the box, this can be inspected visually (as one of the MOSFET chips will be at a slight angle, or not make the correct contacts.

Warning

If this is the case, get into touch with us immediately before soldering to your ESC as we will be able to replace it for you. (if you do solder to your ESC then this would void any dead on arrival warranty replacement).

If you have already used your ESC and on visual inspection you notice one of them seems to be burnt/have some damage then this may be down to user error (such as over current, overheating etc…) Please still get into touch with us so we can see if we can still help, but it is not guaranteed we can issue a replacement under warranty.

2 - Check Continuity on your ESC/MOSFET

If you cannot see any issue visually the next step is to test the MOSFETS themself with a multimeter.

With your ESC unpowered (i.e. no battery connected):

  • Put your Multimeter into continuity mode

  • Place one probe on the negative battery terminal/connector, and then check for continuity on each of the motor connectors using the other probe. If you do get continuity make note of what motor this is on, as there is an issue with a MOSFET on this ESC.

  • Repeat the above but for the positive terminal (one probe on the positive battery terminal/connector), record the location of any continuity beeps

  • Assuming you had an issue, now we move onto the actual MOSFET for each motor you noticed an issue on. Place one probe on one side of the MOSFET, and move the other probe along the connectors on the other side to check for continuity, if you do get any continuity then mark this MOSFET as faulty.

The video below shows you how to test for this using a multimeter. As a bonus it also shows you how to can repair using a hot air gun.

https://www.youtube.com/embed/S4IxSPASWbM

3 - Check your motor and flight controllerIf you do not get any continuity, proceed to check the motor, as the fault could be on your motor or flight controller, see - How to troubleshoot your Motors and ESC (Betaflight)

Hope this helps you to narrow down the cause of your issue, however, please feel free to get into touch with us if you purchased your ESC from us as we will always be happy to help where we can/

Can you also send a photo, showing how the AIO has been secured down to the frame? I think they want to see what is mounted between the AIO and the frame specifically.

Hope this helps.

If you have any other questions, please do let me know?

Regards,
David

Unmanned Tech Support

6

hi David,

The readings are below from a multi-meter

Probe on Negative

  • Motor1 -697

  • Motor 2 - 700

  • Motor 3 700
    Probe on Positive

  • Motor1 -990

  • Motor 2 - 990

  • Motor 3 - 990
    i am not an expert, where does this leave us?

thanks
Jason

7

Hi Jason good day,

Please can you make a short video demonstrating this so I can go back to Tmotor?

I’d like to get this resolved as quickly as I can for you.

Regards,
David

Unmanned Tech Support

8

Hi

Attached is the video

Thanks for helping

https://photos.app.goo.gl/WgKEWPLEgABrhox68

Jason Palmer

9

Hi Jason good morning,

The glare on the screen is so bad I can’t even see the readout, I’ve sent it off to see if Tmotor can use it.

Will update you when I hear back from them.

Regards,
David

Unmanned Tech Support

10

Hi David

I understand, trying to record and test whilst getting perfect lighting was a challenge.
There is reading but the motors 3 still doesn’t power up
Thanks for your support

Many thanks
Jason

Jason Palmer

11

Hi Jason good morning,

Thank you for submitting your return request. An RMA (Return Merchandise Authorization) has been created for your order.

You should receive an email shortly at the address associated with your order. This email will contain:

  1. Your RMA number

  2. A link to our RMA form

  3. Instructions for completing the return process

Please check your inbox (and spam folder) for this email. If you don’t receive it within the next hour, please let us know here.

Remember to complete the RMA form and initiate your return within 30 days. If you have any questions, feel free to ask them in this thread

Regards,
David

Unmanned Tech Support