repairing ORBEA Li-ion Battery Charger (Model: BC299360040)

Niklas wrote:

Hello, Without the complete schematic, it's difficult to identify the exact cause, but checking clock signals, reset timing, and power stability would be a good starting point. Many embedded issues come from initialization problems rather than software alone. Older digital designs using HEF4040BP discontinued stock (https://www.ovaga.com/products/detail/hef4040bp) also require careful verification during maintenance. I'm currently working on repairing my bike charger, the ORBEA Li-ion Battery Charger (Model: BC299360040). I’ve already found the fault and now need to replace the two blown resistors. That’s where the problem is. Does anyone know the values for R31 and R42, or even have the schematic? Unfortunately, I haven’t found anything online, so I’m hoping that one of you has already repaired this charger or has another idea.

Thanks a lot! :D

Looking at your photos, R31 and R42 appear badly burned, so I'd avoid replacing them until the root cause is found. They may be current sense or startup resistors, and something downstream could have shorted. If someone has the same charger, measuring those resistors in circuit or sharing a high resolution photo would probably be the quickest solution.