Looking to upgrade my 15" lcd on the kitchen counter. Purchased many yrs ago. Has an external power brick. Do the new lcds, 17" - 19" still have external bricks?

I have no idea, but you could check the manufacturer's website for individual models.

The Curtis brand that HH Gregg puts on sale a lot does have external PS the 19" and 24" both. The off brand "Broynic" or something like that does not but it has no HDMI out