I deal a lot with a legacy device with an EL backlit LCD. The backlight
on this unit fades badly over time and the inverter is also prone to
failure, so I sometimes need to fix them. Not only that, but EL backlit
LCDs seem to be getting hard to find, and in particular the LCD module
used in this unit is now almost impossible to find.

So I'm thinking maybe I could start using LED backlit LCDs, which
are much easier to find. The inverter for the original LCD takes
5V dc input and produces 100V ac at 400Hz. I'm thinking I could
just bypass the inverter altogether and route its 5V dc input
directly to the LED backlight.

Is this a reasonable plan?

Would I need to worry about the LED backlight drawing too much
power?