24v DC to 12v DC converter for LED backlight

[Heckler]

the dc/dc converter you pointed to SHOULD work BUT may generate some(a lot??) of RFI. You may want to get one and test it.

I'm curious... why were you not satisfied with two LED strips in series?? Was it too dim? or too dificult to wire up that way?
From my perspecitive that really seems the very simplest way to solve your problem without the need for any more external components.

I would also breadboard up the circut and try the PWM via the ULN2003's and use the native 24vdc. (they can easily handle that voltage) If you keep the ON-duty cycle very short you should be ok.

Anyway... just trying to help you find the simplest solution.

[PJALM]

If I try connecting 2 LED strips in series the internal power supply just clicks and turns off and on. Maybe this whole time there was nothing wrong with the original backlights and was the internal power supplies at fault the whole time lol. Too late now, I allready converted them all to LED backlights.

[PJALM]

Well the power supplies seem to be fine so I am going to continue with this project. Until I manage to get the 24v-12v DC/DC converters I am going to use the external 12v PS and start building the PWM control board and see if I can start writing the code.