this post was submitted on 01 Nov 2025
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Can bus computer burnt out (infosec.pub)
submitted 1 week ago by Aussiemandeus@aussie.zone to c/askelectronics@discuss.tchncs.de
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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.

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[โ€“] Labotomized@lemmy.world 4 points 1 week ago (1 children)

Do you have a schematic for it? That could help pinpoint where a failure causing those symptoms could be. You may also be able to measure the voltages going back from that plug and see where the issue is occurring. But a schematic would be very helpful there too!

[โ€“] Aussiemandeus@aussie.zone 3 points 1 week ago

I wish we had a schematic.

Even when I worked for Liebherr once a circuit entered a control module it may as well be a magic box Liebherr are very protective of that information.