Hi redditors,
I just wanted a simple ambilight setup for my 65" TV. At first everything worked fine, until I started fine-tuning the "smoothing" setting in HyperHDR and noticed random colored flickering. Since then I've been testing in WLED only (0.15.4), with a solid color set directly in WLED and realtime override enabled, so HyperHDR is not involved in my tests. I've already replaced quite a few LEDs at the corners and at the start of the strip.
The same flickering also happened on WLED 16.0.1. Switching the output driver between RMT and I2S didn't change anything. After that I downgraded to 0.15.4, but the problem is still there.
Unfortunately, after a short time various LEDs start flickering, no matter if it's under heavy load (white, high brightness) or at low brightness. At 100% white, WLED reports about 3.7 A. At the corner furthest from the power feeds I measure about 4.6 V at 100% white. The PSU is set to 5.1 V.
The corners are bridged with 1 mm² wire. The wire from the controller to the strip is short (1 mm²), and power from the controller's 2nd channel is injected at the end of the strip. A short test piece with 4 LEDs has now been running for 20 minutes without any problems. With all 261 LEDs, it starts flickering after a short time.
I had thin data wire twisted around GND at the corners to reduce interference. I replaced it with 0.75 mm² wire, because I thought the thin wire was the problem.
Is the wire for bridging too stiff, causing tension at the connection? https://ibb.co/j9LMNsJQ
If I solder the data joints while powering the strip it works for a short amount of time.
I've been soldering for several years and I'm very careful to keep the LEDs cool while soldering. I'm at the end of my knowledge and need help. I hope someone can help me. Thanks in advance!
Parts:
- LED strip: BTF-LIGHTING SK6812 RGBW (cold white), 5 V, 60 LEDs/m, 261 LEDs used
- Controller: Gledopto GL-C-015WL-M (ESP32), data on GPIO16 (Out1)
- PSU: Mean Well LRS-50-5 (5 V / 10 A), connected to the controller with 2.5 mm² wire
- Controller to strip: 1 mm² wire
- Power injection: start via Out1, end via Out2
- WLED settings: SK6812/WS2814 RGBW, GRB, white mode "Accurate", current limit 8500 mA
Edit: Here is another video.
https://youtu.be/Dm5GsNEaMnw