Zitat von
Drahti
The "problem zone" with corrosion (!) has nothing to do with HG550 modification.
Some part of modification you can see in the upper-left corner of the first picture. There is a region of three solderpads. The connection of middle and right pad is opened and left to middle one has been soldered.
Ich würde das Teil wenn möglich zurückschicken.
I would send the part back if possible.