rfranzk
Member
Hello All,
I am working on an air quality instrument where the original LCD display was damaged by water intrusion. The original CCFL backlight displays are either obsolete discontinued or only available in lots of 100 plus.
I have located displays matching the original except for the LED backlight. The original has an external DC to AC inverter that is supplied with 15 VDC. There is room on the board to replace the inverter with a small footprint circuit to power the LED. The LED backlight calls for 5 VDC supply and typical current of 120 milliamps. Do I need a simple resistor divider, zener regulator, regulator ic, or dc-dc converter to power the new backlight. The instrument runs 24/7 but the backlight is only used when performing maintenance on the instrument. The backlight might run continuously for an hour or so and then is not used until the next maintenance interval which is approximately once a week.
I just don't know the most efficient and effective circuit to use and any recommendations would be helpful.
Thanks.
rfranzk
I am working on an air quality instrument where the original LCD display was damaged by water intrusion. The original CCFL backlight displays are either obsolete discontinued or only available in lots of 100 plus.
I have located displays matching the original except for the LED backlight. The original has an external DC to AC inverter that is supplied with 15 VDC. There is room on the board to replace the inverter with a small footprint circuit to power the LED. The LED backlight calls for 5 VDC supply and typical current of 120 milliamps. Do I need a simple resistor divider, zener regulator, regulator ic, or dc-dc converter to power the new backlight. The instrument runs 24/7 but the backlight is only used when performing maintenance on the instrument. The backlight might run continuously for an hour or so and then is not used until the next maintenance interval which is approximately once a week.
I just don't know the most efficient and effective circuit to use and any recommendations would be helpful.
Thanks.
rfranzk