This is what’s known as a Master 4 module in a LHM550 Liebherr harbour crane.
Earlier this week it was hit by lightning causing the module to output a combined 8 volts out on the can line 3 circuit.
The rest of the module works fine, all functions work except anything related to can line 3.
Can line 3 output is the 2nd white plug port on the top left of the photo.
I know it’s probably a long shot but does anyone have any familiarity with these kinds of things?
I have added a couple more photos in the comments.
I couldn’t visually see any sort of obvious fail point.
Does Liebherr not support this model anymore? For something like controlling a harbor crane where failure could be deadly I would think they should be the first point of contact and they should probably just be going ahead and sending a replacement part. Lightning can do weird damage to electronics even without a direct hit, so even if you find and fix a more obvious problem something else could be lurking that bites you later. When that’s controlling something that moves tons of cargo through the air I would think the safest course is to just replace the damaged part.
Replaced already was just an exercise in curiosity.
Liebherr don’t repair them they just sell a new part.
(I used to work for them before going independent)