My Blue Ring tester stopped working, went blank, and would not respond to any inputs. It's possible that the test leads were connected to a live circuit, and/or the circuit under test had a live cap and the discharge fried something in the blue ring tester. Or, it may have been something else. This happened more than a year ago. I want to get it working again and am looking for instructions on how to troubleshoot my dead blue ring tester.

I have the original assembly instructions and the circuit diagram but lack the know how to understand and isolate circuits and check them for...