I bought (off e-bay) an LCD brake 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?