nRF52840 power on led(Led 5) blinking continuously

RE: nRF52840 power on led(Led 5) blinking continuously

Amanda Hsieh — Mon, 15 May 2023 14:39:34 GMT

Hi,

I think your issue is handled by this case ld5 flashing quickly, board not visible, PCA10056 IF BOOT not work! .

-Amanda H.

RE: nRF52840 power on led(Led 5) blinking continuously

Michael111 — Mon, 15 May 2023 06:03:17 GMT

Hello Esmaeill,
does the board shows up as "bootloader", after you pressed RESET when powering the board up?
Best regards,
Michael

RE: nRF52840 power on led(Led 5) blinking continuously

Esmaeill — Sun, 14 May 2023 19:06:00 GMT

I have same problem :(

"press the IF BOOT/RESET button while power cycling" not worked for me & led5 blinking continuously !!

RE: nRF52840 power on led(Led 5) blinking continuously

Michael111 — Wed, 10 May 2023 13:29:20 GMT

What causes this problem?

RE: nRF52840 power on led(Led 5) blinking continuously

Michael111 — Wed, 10 May 2023 13:26:48 GMT

This worked for me. thanks.

RE: nRF52840 power on led(Led 5) blinking continuously

Amanda Hsieh — Tue, 04 May 2021 09:13:12 GMT

Hi Pankti,

It might be a bad USB HUB, or/and the USB cable is power-only. You can try another cable or connect the cable directly to the computer, and not via a USB HUB. We have had cases the customer had 4 power-only USB cables, the 5th USB cable had data lines.

-Amanda H.

RE: nRF52840 power on led(Led 5) blinking continuously

pankti583 — Fri, 30 Apr 2021 13:49:38 GMT

Hi Amanda,

I performed the above step after reprogramming, LED still blinks. It even got reset few times.

Thank you

Amanda

RE: nRF52840 power on led(Led 5) blinking continuously

Amanda Hsieh — Fri, 30 Apr 2021 08:15:59 GMT

Hi Pankti,

After reprogramming the JLINK firmware, resetting the board again, for instance powering off and on again, should get it back into the normal state (LED 5 lights up continuously).

-Amanda H.

RE: nRF52840 power on led(Led 5) blinking continuously

pankti583 — Thu, 29 Apr 2021 17:12:13 GMT

Hi Amanda,

I tried the above steps, the led was blinking still. Power Led 5 is still blinking but it doesn't reset the code. Is it normal for led 5 to blink? or it is indicating some issue?

Thank you

Pankti

RE: nRF52840 power on led(Led 5) blinking continuously

Amanda Hsieh — Thu, 29 Apr 2021 11:03:26 GMT

Hi Pankti,

Try to press the IF BOOT/RESET button while power cycling the kit. It should then show up as a Removable Storage Device named "BOOTLOADER". Then you can drag-and-drop the J-LINK interface MCU firmware found here (v170724) onto the storage device to reprogram the JLINK firmware.

Please let me know this can help or not. Thanks.

-Amanda H.