BMW X3 F25 rear/tail light not working? Here is my way of fixing it.
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The "PCB From PCBWAY" text on the PCBs shown in this video was added by me. It's not something that gets automatically added to the board.
This project may have been secretly discussed in a previous video. This is main project video, where I reveal where this circuit will be used.
BMW X3 (F25) with LED tail lights has a flaw in the design of tail lights. The LED drivers on each of four tail lights is linear type. High voltage difference between input and output on linear regulator is yelling "TROUBLE!". Most of the input power is wasted as heat.
That and lead-free solder are most likely the cause of failed solder joints on those original LED driver boards. They could be fixed by resoldering some of the components, but that's not a permanent fix.
Switch mode LED driver like the one I made has much higher efficiency and thus produces next to no heat at all. I choose to use SD42522 -IC, which offers decent efficiency and performance in general, for quite low price.
Based on few months long testing, this design seems to work just fine on the BMW X3's tail lights.
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