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Question DetailsAsked on 8/27/2015

I need to have someone who does indoor Christmas tree light repair

repair lights on a pre-wired Christmas tree. Two strings are out.

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1 Answer


Usually it is just a matter of replacing bulbs one by one till you find the one (or ones) that are killing the string. Many older strings (non-LED especially) die if only one bulb burns out (wired in series), so you have to take a known good bulb and working along the string, incrementally swap out bulbs one at a time with that good one till you find the one that is bad. If you are unlucky there is more than one so even after swapping all one by one you still do not get a string that works - so sometimes it works better to just take all the bulbs from a totally good string and put them in the "bad" string to see if the string or the bulbs are bad, then after confirming the string is good (by all bulbs working) swap in the old bulbs from that string one by one to eliminate the bad bulbs (the ones that make it die).

Easiest to do this using a plug strip with an on-off switch so you don't wear out the plug or outlet unplugging and plugging it back in every bulb. You do NOT want to do this "live", because of the risk of electrocution either due to the exposed contact wires on the outside of the mini bulb holders, or due to a bulb breaking while handling it. Also - use good gloves doing this, because incandescent (filament type) christmas bulbs sometimes get very brittle after heating and break easily.

Professionally - probably 99% certain to cost more than just buying new strings and putting them on the tree and cutting the old strings off - your Search the List category would be Appliance Repair - Small (a countertop appliance repair shop). Or a Handyman with volt-ohm meter to check for power to the strings, then either replace the plug if it is bad, or to test each bulb in turn to find the bad ones.

If you do replace the strings - I recommend LED strings like Vickerman makes - when a bulb goes out the rest of the string stays lit, so makes it very easy to tell which need replacing, though if you leave many out for any time the others tend to wear out faster too from the higher voltage.

Answered 5 years ago by LCD

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