LED dimming module

[fastpcuser]

I have a LED light with two drivers( ballast) each driver has a dimming module connected to it. One of them turns on but stays dim and does not do anything when turning the potentiometer . It lloks like IC1 died but I can't figure out what IC1 is, there are no markings I have checked other one as well. Every other component seems t be ok potentiometer and adjustable resistor work good as well.

There are 4 pins:
1: On/Off — reads 0V when the potentiometer is off and 10.77V when on
2: +12V — reads 11.78V, comes from the LED drivers
3: PWM (0-10V)
4: GND

 

[kellys_eye]

The active device is this:

http://cds.linear.com/docs/en/datasheet/1002fb.pdf

but if that's a Chinese-origin board you'll find it's cheaper to buy a new board than get the chip!

 

[fastpcuser]

Thanks for the reply.

It is a Chinese board but I cant find anything close to it anywhere. Also LT1002 looks like it only comes in through hole but this one SMD.

 

[fastpcuser]

Would there be any other way do make this dimming module if I can't find correct parts ?

 

[turbogt16v]

Here

 

[Alec_t]

I have a LED light with two drivers( ballast) each driver has a dimming module connected to it.

Why does one light need two driver modules?
Looks to me, judging by the two sockets (connectors) in post #1, that one dimmer controls both LED driver modules. Can you confirm?
If so, does swapping the plugs over affect which driver module is/isn't dimming?

 

[fastpcuser]

Here

I was thinking something similar size to the original as it has to fit in the light fixture.

There are two ballast each of them controls two sets of 9 leds to create custom color spectrum. This is used for reef aquarium. The fixture contains two of these boards one for each sets of led's. I can connect both ballasts to one dimmer but that will turn both of them at the same time and not allowing to create custom light color/spectrum.

That's why I either need to find out what IC is it on the board or make something similar. the Pot act as on/off switch as well.

 

[fastpcuser]

something like this would work but this is only 5v and i need 12V

https://www.aliexpress.com/item/PAM...ntiometer-can-be-USB-powered/32286740191.html

 

[turbogt16v]

You can open that plastic box it's 4 screwes, inside is small board ,like yours

 

[fastpcuser]

I wonder if it can be either LM324 or LM2902

 

[turbogt16v]

Why is that important, it will work