Hi All does anyone know what sort diode D7 is. The unit i have has no marking at all and is a dead short. It connects to the Rectifier BYD29-200. Most of the ICs etc have been painted over.

 

You did not say which charger you are trying to repair.

References:
https://forum.allaboutcircuits.com/threads/milwaukee-m18-rapid-charger-repair.168077/

https://forum.allaboutcircuits.com/threads/milwaukee-m12-18fc-charger-repair.200177/