Ikea LED1836G9 - Interesting failure mode

I&rsquo;ve had an Ikea Trådfri LED1836G9 fail, and I wondered what would be wrong with it. It just dropped from my Zigbee network, and re-applying power did not change anything. Would it be the LED&rsquo;s? Just a simple fuse? Let&rsquo;s dive in. To take these apart, just apply some gorilla-strength and pull apart the milk white dome from the body of the housing. You&rsquo;re then greeted by a…