It doesn't seem to be that, I had wired everything properly and tested before putting back on the tank. I had initially taken the pi offline to test a new audio DAC, it wasn't working properly on the pi 4, the manufacturer wanted me to check on a pi3 and report back, somehow when I put the pi back on the tank my Arduino stormx clone fried along with its PCA 9685, even the reef pi's PCA 9685 stopped working at the same time. The replacement Arduino came after 10 days, only then I discovered the PCA 9685's were not working, the replacement was put onto to reef pi and lights were back working (5 mean well ldd's had also failed, only 3 were ok), in the mean time I decided to change the l293d motor drivers to l298's my order was out to be delivered so I took the pi offline and prepared to swap out, only one l298 was in the packet, so back went the l293 boards, one channel was faulty and irritating me (fault on the IC) so back on the tank and lights working without issue. The new board came after 4 days, I prepared it and waited until the Mrs went to her parents house for the weekend, done the swap all tested no problems, next morning back on the tank and no lights, no power on the mean well PSU, removed only the PSU, strangely the fuse on the plug had blown (I use UK plugs with fuses where possible) swapped out the fuse, BANG! the PSU stopped working, the replacement ordered came on Sunday, 12 days without lights, earlier I had the t5's as a back up for emergencies, now the ballasts don't work either.
So that's the story, this all started in June, previously my diy chiller conked off in feb, rusted to bits the replacement 2nd AC unit had a faulty compressor, didn't realise this until the hot summer which runs from late march to early June, this was also during lockdown so couldn't swap out the compressor, I got that done last month. Needless to say the tank is quite pi55*d right now.
Back to the dimming, I'll try it from another pin, it's only one channel, the other in use works properly, I've got some replacement LDD drivers on the way, once they arrive I'll check the circuit again.
What I wants to know is there anyway I can refresh the installation of reef pi?
Maybe go back to an earlier version and then back again?
I'd like to rule that out, some other things are acting weird on the pi, I'm thinking something may have become corrupt
@Ranjib maybe you can advise?