Step 1 if you re able to locate a bad bulb just unseat the bulb remove the bulb from the plastic base and replace it with a similar bulb.
Christmas light bad bulb finder.
How to find a bad bulb in christmas lights press down the black button hold the tip about 1 2 in.
Finding bad bulbs on led christmas lights.
There s a way to test and fix the entire string of miniature lights without testing each bulb individually.
If you have led christmas lights with removable bulbs the troubleshooting process is similar to incandescent bulbs.
On one side of a dead bulb the red led will glow and on the other side the green led will glow.
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Many led christmas lights are made without removable bulbs so the circuit won t fail if a single bulb breaks.
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Starting at one end of your strand or in the dark portion of your strand use your voltage detector or light tester to locate the faulty bulb or dead length of wire.
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By probing your way back and forth you can quickly get to the bad bulb.
Otherwise the operation is the same as the neon bulb version.