There is a backlight connector on the Rex J19. I believe, the BKL_ADJ could be what you are looking for. It is connected to PWM1_OUT. At the current schematic, it will generate voltage level based on the PWM, but I believe, if you need PWM, you can setup the LM358 just to work the way to transfer LVDS0_PWM to BKLT_ADJ (you would have to test it).
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