Try a 10K potmeter and turn it until backlight is appropiate. Use a digital Multimeter to determine the value of the potmeter. Then look for a matching resistor, eg if the pot = 5K you could use a 4K7 resistor.
Try a 10K potmeter and turn it until backlight is appropiate. Use a digital Multimeter to determine the value of the potmeter. Then look for a matching resistor, eg if the pot = 5K you could use a 4K7 resistor.