I bought (off e-bay) an LCD break-out board HDMI thing for a macbook 17" LCD display I harvested.

The seller has said repeatedly I need a 12V 4A power supply for it, and there is even a photo of a lab bench power supply with an X through it.

They really seam to mean it, and they would know I guess.

4A seams like a lot, and why not a lab bench power supply?

Any ideas or experience?