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.
Equipment used:
- 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