Please help! LM301B Board started flickering. Some LED dont turn on anymore :(

[peregrines]

My lm301b strip board (mothers & clones) started flickering all of a sudden after running it almost 5 months.
First, only some LED would stay off and flicker - meanwell more than 50% seem to be dead.
I built 4 identical boards and now the second board shows the same symptoms.

When I use the dimmer knob and turn up power - more LED are coming alive, when I turn it down (Meanwell dimmer) - almost no LED are on anymore.

Please help me what can cause this kind of problem.
I dont think I build something wrong (because it was running really soft and cool and also for months without problems).
Could it be something with my electrical network?
Could it be related to switching on too many LED at the same time? Or is it because I have too many things on the same electrical installation?
I am using Sonoffs and have about 2000 W in the same room in LED. The small panels are just for my mothers and clones.
Please help me! I dont want to loose more boards :/

Watch IMG_6064 | Streamable

Watch "IMG_6064" on Streamable.

streamable.com

 

[BobThe420Builder]

Re check all connection's 1st

 

[SwiSHa85]

How many amps on the circuit? Whats the breaker rated amperage? Every flicker problem I've had was just to many drivers on the same circuit.

 

[cobshopgrow]

My lm301b strip board (mothers & clones) started flickering all of a sudden after running it almost 5 months.
First, only some LED would stay off and flicker - meanwell more than 50% seem to be dead.
I built 4 identical boards and now the second board shows the same symptoms.

When I use the dimmer knob and turn up power - more LED are coming alive, when I turn it down (Meanwell dimmer) - almost no LED are on anymore.

Watch IMG_6064 | Streamable

Watch "IMG_6064" on Streamable.

streamable.com

had something similar using chinese LM301b 288er led boards.
where did you bought the strips? original samsung strips?

 

[Rocket Soul]

My lm301b strip board (mothers & clones) started flickering all of a sudden after running it almost 5 months.
First, only some LED would stay off and flicker - meanwell more than 50% seem to be dead.
I built 4 identical boards and now the second board shows the same symptoms.

When I use the dimmer knob and turn up power - more LED are coming alive, when I turn it down (Meanwell dimmer) - almost no LED are on anymore.

Please help me what can cause this kind of problem.
I dont think I build something wrong (because it was running really soft and cool and also for months without problems).
Could it be something with my electrical network?
Could it be related to switching on too many LED at the same time? Or is it because I have too many things on the same electrical installation?
I am using Sonoffs and have about 2000 W in the same room in LED. The small panels are just for my mothers and clones.
Please help me! I dont want to loose more boards :/

Watch IMG_6064 | Streamable

Watch "IMG_6064" on Streamable.

streamable.com

Theres some burnt out diodes there to start with

 

[peregrines]

Thanks so much everyone for your help!

How can they just burn out? I ran 3590 Cobs under the same conditions for almost 3 years without any problems!
The lm301b are Original Samsung from a trusted source in Germany (LED-TECH).
I am running two boards with 2x 480 Watts + 3 boards with 80 Watts on two 12 A Breakers. They never tripped so far!
The small (now burned out) boards are running @350mA
The big boards (480 Watts) are running @ 1050mA (these are not showing signs of burn out, but I just installed them and saw some flickering already when I dim them down)

I carefully checked on all the connections regarding the lamps already!
Swapped my Meanwells to make sure its not related to them.
Could it be because I used a Sonoff to time them and programmed the same starting time for all of them?
My friend told me I should alter starting times a bit so they dont produce a voltage peak. Could that lead to burned out diodes?


I am really frustrated :/
Know almost nothing about electricity - so any help related to finding the cause for all this would be highly appreciated!!

 

[cobshopgrow]

i doubt its related to your Sonoffs.
youre sure theyre really start all the same time, really same second?
i think theyre within a 30sec range, often less

have no definitve answer for the burned leds, would like to know myself.

i drove my leds with very low currents and got a similar behaviour, doubt they burned from exesive current in your case.... while not knowing what you did there.
your U channel construction looks very solid, otherwise one could suspect mechanical stress killing the leds over time.
mechanical stress always ocurs when they heat up and cool down, but they should last longer then 5 months for sure.

no screws so nothing you could have scratched and created a short i guess.

have you asked Ledtech if they know this?

used and still use cxb cobs without any failure, since i switched the led stripe manufactorer i dont have this problem anymore btw.

 

[Mak'er Grow]

Have you tested your dimmer...sometimes the cheap pots get warm and wear easily...just a quick thought...lol
Like the old stereos that crackle when you turn them up and down...99% of the time its a dirty pot.
Best of luck and happy growing.

 

[Samwell Seed Well]

Have you tested your dimmer...sometimes the cheap pots get warm and wear easily...just a quick thought...lol
Like the old stereos that crackle when you turn them up and down...99% of the time its a dirty pot.
Best of luck and happy growing.

"Cheap pots" , " dirty pots" ...whats exactly is a pot in this usage?

 

[cobshopgrow]

a dirty potentiometer would influence the whole fixture, all leds, would say.
if only flickering would be his problem youre right, but there are random groups of leds dim.

higher current mean more heat expansion and more resistance in the traces.
seems this makes some leds work again, had the same.
beside mechanical stress i have no real explanation.
the batches led-tech used should be fine and org. samsung, guessing.

 

[Mak'er Grow]

"Cheap pots" , " dirty pots" ...whats exactly is a pot in this usage?

potentiometer

 

[Mak'er Grow]

a dirty potentiometer would influence the whole fixture, all leds, would say.
if only flickering would be his problem youre right, but there are random groups of leds dim.

higher current mean more heat expansion and more resistance in the traces.
seems this makes some leds work again, had the same.
beside mechanical stress i have no real explanation.
the batches led-tech used should be fine and org. samsung, guessing.

I agree its an odd one...just it was the 1 part he didn't test...shot in the dark...lol

 

[Mak'er Grow]

Just noticed the lights look like multiple sections of 7 LEDs mini boards added together in rows.
@peregrines can you take a pic of the board(s) up close...doesn't need to be on.
Any recent electrical storms in your area...power go out?