I have the same problem and i tried to fix it, my Christmas lights are 120v and 60Hz AC. The problem is when i brought m lights out and plugged them in, for some reason the whole entire light string wasn't working. So i looked at the fuse and the fuse was OK, so then i looked for any bad light and i think i found it. I went to the market to buy a replacement and found out the old bulb was bad. But apparently when i plug it in the lights light up but only half way. So fro not working i got to work but it only works have way. what can i do to fix it. Please inform me by step by step on how i should fix my lights.