Restoring the first LED low beam on the Mercedes E-Class W212 didn’t even involve dealing with the LED itself – it was fine. It was the electronics block that needed attention.
Block has a couple of constituents who thought it would help from hard work and retired. In some cases, a component that is no longer in production is also broken. Fortunately, there are still stocks left in the world and the block is viable.

A typical symptom is the daytime running light and the LED headlight not lighting.