When an entire panel of lights is out the reason is almost never a single burnt out bulb unless that bulb s shunt is also broken.
Christmas tree lights string out.
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One light goes out rest stay lit is a technology that uses an internal shunt within the bulb to continue the flow of electricity throughout a light string even if a bulb has burned out.
Modern string lights have shunts to redirect the flow of electricity when a bulb burns out so only the individual light bulb is affected.
You may find that the bulb has a black or silver looking stain on the inside.
It is important to understand that if the shunt is broken when a bulb breaks or if it is dislodged due to a loose bulb the flow of electricity will stop.
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Buying christmas light replacement bulbs should always be your last step.
Modern sets of mini lights have a small cartridge fuse found in the cord plug inside a small sliding door.
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Step 1 check the entire strand of lights for a missing damaged or abnormal looking bulb according to the christmas light company website.
Check the fuse on the light string.
Some light strings may have two fuses.
If this is your problem carefully replace the bulb after first unplugging the string of lights.