I'm kind of stuck. I build a ceiling lighting in a smaller room using led trips in a rectangular shape with aluminium channel for better heat dissipation. All went well, until a couple days ago in the evening I found that my led strip has a very faint light when turned off (only visible during the night in nearly complete darkness). In the last days I've been there and back and couldn't find the cause.
- V-TAC PSU 230V input, 24V output (max 150W)
- SkyDance SD T1-1(White) wall controller (only used as a remote)
- SkyDance SD V1 controller (controlled wirelessly using the wall unit)
- V-TAC 700led/m led strip with a total 4.6m length (21W/m)
I'm using a multimeter to read voltage levels and all seems to be well until I turn the controller off. Setting the brightness to max levels on the SD-V1 controller, the input voltage is 23.8V, the output voltage is 23.7V, led strips light up as they should. No flickering, nice even light.
When I turn it off however, the I'd expect the voltage to drop to a 780mV range. Instead, I read -11.7V and the led strips remain on with a very faint light. I've already changed all equipment tested them separately everything works. If I disconnect any led strip segments they all behave the same (negative voltages while turned off). I took a smaller piece of the same led strip, disconnected the 4 strips and connected only the small piece and surprise, when turned off the voltage dropped to the ~780mV range with no faint lighting.
Any idea what can cause this behavior? I can eliminate the faint glow by adding a capacitor at the output of the SD-V1 controller but I'm rather interested what's causing it. I checked everything already and couldn't pinpoint any problems.
- Solder points are insulated using hot glue
- led strip segments do not touch eachother
- cabling has no apparent damage
- cabling continuity is fine
- distance from "high" voltage lines (230V) is ~60cm and I'm using insulated cables