C9 LEDs Not Working Properly

[superslim0five]

I have several boxes of C9 incandescent bulbs and I planned to swap the bulbs out with LEDs. After replacing them, I have noticed that 1/3 of the string does not light up. To confirm that it is not the bulbs I have swapped them out with the others on the string that are working and it seems to be the socket that is the issue. I have noticed this on 3 strands so far. Is there a reason why the existing strand will not work or is there something else I am missing?

[Dennis Laff]

Look in socket and pry up the bottom contact a little it might  not be making contact with bottom of the new bulbs 

[Mr. P]

I want to bring something up that maybe TheDucks can answer. I know a string of 100 bulbs is actually two strings of 50 combined together, now if someone has a string of C9 incans and they unscrew the incan bulbs and replace with C9 leds does that bring up an issue? I mean with led strings it is recommended not to cut so how would led replacements affect the strings?

[Dennis Laff]

The c9 leds are replacement for c9 bulbs  in   110 volt strings.

[TheDucks]

C9's are stand alone 120V.

Broken wire between the last working  and next is my guess. BUT 3 strings. Were they abused? Always the same 1/3! Does not compute

I would look at the center pin like Dennis suggested.

WITH THE CORD UNPLUGGED.  Gently hook the center tab and lift just a bit

Edited November 4, 2019 by TheDucks

[superslim0five]

Yep Dennis that solved it. The bulb sizes look the same but apparently not. Once I raised the center contact up a bit for each of the non-working sockets they turned on. Of course, this is labor intensive since you have to keep plugging/unplugging to see if it works but I guess that is the nature of this hobby. Thanks again for the help.

[Dennis Laff]

Glad  you got them working.

[DLH lites]

two years ago I replaced all the c9's I had  , ten strings with c9 led replacements from menlon, same problem  some worked some didnt ,  I had to pry up the bottom contact and also the side ,  they ,look great and dim  very well. I also did 20 strings of c7's  . The c7's were the same product and look just like a incan .  Even here in Fort Lauderdale we do  live tree every year and the c7's  are for that tree.   We are from NY and one thing I really miss is going to the tree farms in the catskills and cutting down our tree's  ---BUT putting up a tree in shorts and flip flops does have it's advantages.

David