Answer to: Half of the string of LED Christmas lights doesn't light up.Hi Chris Its behaving like strings 3 & 4 are hooked up in series to the female end of 2. The only way I can see this happening is if there is short in that #2 female. (not the #3 male) Any sign of heat in that end? There should be none; LED's draw very little current, and a heavy current draw would create heat. AS you can see from some of the problems above, these things may have fuses in them, but if yours are like mine, the plug end(s) mint contain a fusible link which you cannot repair. Actually, you could IF you had a bad string and you KNEW the plug/fusible link was ok AND that the change-out was for the same number of LED's. IF you suspect dampness is the problem, you can disconnect string #2 and spray a drier in there (or hydrogen peroxide), then knock that out and put some white rice in a bag enough to encase the end, tying it on tight and leave it for a day. Then try again.
Answer to: Half of the string of LED Christmas lights doesn't light up.This business of flipping the plug, using oscilloscopes, or noting hz is all indicative of not understanding Diodes. LED's (Light Emitting Diodes) only work with the current flowing through them in one direction... direct current. Alternating Current (your house current) fluctuates or oscillates 60 times a second.. hence "60 hz". In order for your LEDs to wok on that circuit they need half of those oscillations to be eliminated. They also need the voltage to be greatly reduced.... from 110 down to about 5. LED's also cannot be tested like an incandescent string of lights using an ohmmeter because they have no filament. Testing a bring of LED's would require setting up your multimeter as an ammeter, breaking and testing the light string only (not the other two lines. Because the string is made to work AS A WHOLE UNIT with AC power, the observation that flipping the plug should alert you that this function has been destroyed. The fuse was there to prevent further damage (fires). The fact that you can replace th...
Answer to: Half of the string of LED Christmas lights doesn't light up.I have never seen light strings with fuses in the plugs will have to look again, but what we DO have is light strings with "Fusible Links". These strings may well have more than two light series in them, separated by a fusible link on each end of the series. Imagine a ladder where the legs of the ladder represent each side of a 110 volt circuit. The light strand(s) are the rungs with perhaps 20 lights per strand. At the intersection of the "legs" and "rungs" you have a fusible link. If a short or a break occurs in any of the light strands, one or both of the fusible links will blow, are sealed for life, and are not serviceable. That light strand will be out and the rest of the strands will remain lit. The fusible links are for safety, not for convenience. Now for a bit more info. If you try to cut out the fusible links or even replace them with a more serviceable unit, you need to understand something about LED's as opposed to incandescent lights. LED's operate on Direct Current (DC) and will only light with ...