Order #720588 - Radiomaster Tx12 Mkii 2.4ghz 16ch Radio Transmitter W/ Hall Gimbals - Elrs 2.4ghz - The transmitter doesn't power up

Help Unmanned Tech
1

Order Number: 720588
Product Name: Radiomaster Tx12 Mkii 2.4ghz 16ch Radio Transmitter W/ Hall Gimbals - Elrs 2.4ghz
Brand: RadioMaster
Eventually the transmitter powered down(the battery was charged and the wires of the battery were fine) and after that it doesn’t power up
I’ve tried another battery that also was charged and it didn’t work

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2

Hi Kseniia good day,

I am really sorry to see you are struggling with your new TX12, I can imagine how frustrating this has been.

Thank you for providing such a detailed video, this really does speed up the process of assisting you. I have already contacted RadioMaster and have asked for their assistance.

We contact the manufacturer of any product when we have a reported fault, this speeds up the process of getting you back in the air as quick as posssible. As soon as I get a response from them I can update you.

Hope this helps.
If there is anything else I can help with please do let me know.

Regards,
David

Unmanned Tech Support

3

Hi David,

Many thanks for your response and update.
Please keep me posted. This was for my son’s who is flying his aircraft models and he was pretty upset when he can’t make it on the field together with other participants:(.

Kind regards,
Kseniia

4

Dear Team,

Could you please update me regarding my request below?

Many thanks.

Kind regards,
Kseniia

5

Dear Kseniia,

Thank you for following up, and please accept our sincere apologies for the trouble you’re experiencing with your TX12 remote not booting up. We understand this must be frustrating, especially with a new device.

Based on the symptoms, this issue relates to the system’s RTC (Real-Time Clock) backup memory. Occasionally, under specific circumstances (like an unexpected power loss while saving data, or an SD card error), incorrect data can be written to this memory area. When the remote tries to boot, it gets stuck verifying this incorrect data. Even reflashing the firmware won’t fix it because the problematic data remains in this specific memory powered by the small button battery.

The good news is there’s a known procedure to clear this memory. Please follow these steps carefully:

  1. Safety First: Completely remove the main power battery from the remote control.
  2. Access the Motherboard: Carefully open the back cover of the remote control.
  3. Remove Button Battery: Locate and gently remove the small, round button battery from the motherboard.
  4. Wait: Crucially, leave both the main battery and the button battery disconnected for at least 2-3 minutes. This allows any residual power on the motherboard to fully discharge, clearing the corrupted RTC memory. Note: Simply removing the button battery while the main battery is still connected will not work.
  5. Test Boot (Without Button Battery): Do not reinstall the button battery yet. Reconnect only the main power battery and try to turn on the remote. It should now boot up normally.
  6. Check Functionality: Verify the remote is working. (You’ll notice the date and time are incorrect – this is expected without the button battery).
  7. Reinstall Button Battery (Optional but Recommended): If the remote boots correctly, you can now power it off, disconnect the main battery again, reinstall the button battery, and then reassemble the back cover. The button battery’s only function is to keep the date and time correct when the remote is off. The remote will function perfectly fine without it, but you’ll need to set the time/date after each power-up if you leave it out.
  8. Final Assembly: Reinstall the main battery and ensure the back cover is secured.

Please try these steps and let us know if it resolves the boot-up issue. If you encounter any difficulties or if the problem persists, please don’t hesitate to contact us again, and we’ll explore further options.

We appreciate your patience as we work through this.

6

Good afternoon,

Many thanks for the below, but this doesn’t help.

Could you please advise what our next steps are?

Kind regards,
Kseniia

7

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