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Christmas Light Problem

Discussion in 'LEDs and Optoelectronics' started by spaceman, Dec 12, 2016.

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  1. spaceman


    Nov 5, 2016
    I have a string of the normal miniature lights were one bulb will not light. I have tried several good lamps in the socket and they will shunt and allow the string to light, but that one bulb will not work. All the other bulbs are lit. What is wrong ?
  2. duke37


    Jan 9, 2011
    Some of the christmas tree lights which use series bulbs will short the bulb when the filament fails. Thus the rest of the bulbs carry on working at an increased brightness and shorter life
  3. shrtrnd


    Jan 15, 2010
    Like KTW said, might be the wrong replacement bulb.
    He's my many Xmas tree light repair experience:
    1) Make sure the socket is the right one for your string. Some sockets are deeper or wider, or strangely shaped, and
    universal replacements don't always fit. Try taking the bulb out of the original socket, and put the new replacement bulb in the old, original socket to ensure it fits.
    2) The socket itself could be bad. The string is one of the good ones that has a traveler wire, so the rest of the string lights when one bulb burns-out. But the issue is most likely a bad connection to the bulb at the socket itself. The wire might have disconnected from the metal tab connection within the socket, or the tab may have fallen out. Examine the socket closely, and check continuity to the insertion tabs within it.
    3) With all the twisting light strings go through, a wire may have broken, or disconnected from the socket connection metal tab, even though the insulation covers the break. Another good reason to check continuity to and from the socket.
    4) Heat of the bulb may have warped the plastic socket, keeping the metal tabs within it from actually touching the bulb leads.
    Good luck troubleshooting this.
  4. spaceman


    Nov 5, 2016
    This sounds good to check out. I did not know about the traveler wire. Thanks all for feedback
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