How do you fix prelit Christmas tree lights?

a string of lights has burned out on my prelit artificial tree. Is within any way to check them i.e. not as hard as shifting each bulb?


Answers:    The craft bulb testers. Are you sure it might not be a fuse? Check that
first the work up to the lights.
I've often wondered what to do if you
bought a prelit. That's why I won't, it's easier to replace a string than find a burnout.
Also check to build sure the bulbs aren't loose.
Christmas light tester/I enjoy this one
http://www.christmas-decorations-gifts-s...
no not really, sometimes you can see dark tip or broken filament but not other
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