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I had a Brusa NLG511 come in for repair.

Symptoms: Would not charge, power LED just blinked.

A quick bench test showed it had a short on the +15V supply...

I could not located which part was shorted, so I hooked up the external supply and set it to +15V...

And slowly turned up the current limit until the magic smoke came out:

Computer hardware Electronics Technology Motherboard Computer component

This voltage regulator was the problem:

Electronic component Circuit component Passive circuit component Electronics Electronic engineering

Swapped it out with a new LM2941, and the NLG511 is back up and running. :)

Repair Pics:


This is the second NLG51X that I have fixed with a shorted +15V supply.
So it might be a common failure mode.

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