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grafalex82 / hellozigbee

Hello NXP JN5169 Zigbee
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LM15-NN-A-T2 board stopped responding #13

Open ReX1983 opened 2 months ago

ReX1983 commented 2 months ago

Hello,

Firstly, I wanted to congratulate you for the amazing work and the high quality documentation.

I have many no neutral switches (QBKG03LM and the other model with 1 button) and one of them dropped out from the network and stopped responding to any command, even button press. The leds stopped blinking as well.

I swapped the power / high voltage board LM15-NN-B-T4 (that hosts the two relays) with a new one and the switch returned to work, so the LM15-NN-A-T2 board is actually healthy and the failure is limited to high voltage board.

Have you encountered any similar issue or do you have any idea what could be the issue?

From a visual inspection, I can't see anything wrong with it.

On a different note, do you plan to extend support to the no neutral switches as well?

grafalex82 commented 2 months ago

Hello, @ReX1983! Thank you for the interest to this project.

As soon as you verified that logic board is working, and the problem is in high voltage board, and also taking into account that the switch does not communicate to the network and even does not blink any lights, I suspect that the problem is in the power supply part. Unfortunately I have not yet reverse engineered this part. Moreover I doubt I have enough knowledge in power electronics to tell you anything about it.

I have plans to adjust my firmware to QBKG03LM and QBKG04LM at some point. But unfortunately I am having a high load at my work at the moment, so I guess I could return back to this project in a month or two.