Indeed Mohamed. I've seen not listed asics from manufacturers of certain products before too. And that was a 6 pin smd pwm controller in another indoor device too. Like the Melexis mlx02367A chip with smd code '67A'. Luckily the unknown pwm controller was still working fine here! And the smd code used here therefore probably wasn't any valid useful code.

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Thanks for your valued info Henrique. Sadly there was no aluminium cooler nor any thermal paste applied to this ledkia indoor stairway led light. So hopefully the 6 other lights won't suffer from the same defect.

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Kind regards

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In my case, I am in recent times dealing with LED lighting. The truth about LED lifetime is already known: the component itself (the LED) can have 40,000 hours lifetime according to its manufacturer, but this is only true if it works cool! During operation, the LED dissipates a considerable amount of heat, and a proper cooling system must be provided. In commercial products (most part chinese, of course), in order to lower production costs, the required aluminum area is not sufficient, leading to a lack of dissipation. To make things worse, the manufacturer also saves in thermal paste quantity, i.e., they put few thermal paste between the LED and the dissipation mass. With this, the heat generated by the LED is not transferred properly, causing the LED to work warmer than normal. Of course, in this condition the manufacturer's 40,000 hours lifetime is invalidated.

When I am dealing with these lighting products, I always (when possible) remove the LED, wipe off the old (and commonly insufficient and/or dry) thermal paste and put a new thermal paste, covering uniformly the LED and the aluminum surface. This can be considered a preventive maintenance and surelly improves lifetime.

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I know what you mean and have experienced that issue with other boards (especially those from Led lightbulbs). Removing the bad led on this stairway light with hot air however was very easy and done in only a few seconds.

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