Thanks for the "stuck-tip".
So if there is a setup of many lamps, and I will use a Dali "programmer" device - the best method is to connect just to ONE lamp at a time? (not that I have this setup - just courious).
Is that the way of getting to know the exact address of one specific lamp also?
In the mean time - I experimented with a power supply with max 30-35V (and a current limiter of max 1 amp)....I may have destroyed some of the LEDs. I discovered too late that groups of LEDs are (probably) partly connected in parallell, and I messed around a bit without the brain connected....(my brain).
Using the LED-boards main DC-connections, I could not get any light with the PSU mentioned.
I started using multimeter with diode-test, to check each LED/group. There are 128 groups of 4 LEDS.
The Fluke multimeter handles only up to 3 diodes (0.7 - 1.4 - 2.0V voltage drop), but I checked the last one separate - no problem.
Took me 30 min coming halfway, but it was boring, so I quit...
I noticed the layer under the PCB having cooling paste, but a bit dried out, and maybe a bit to little of it.
I have 3-4 more lamps actually...so...
Maybe I just dump this first one, and I'll see when I takes time for a new one...need some Dali device also
Thanks.