Arturia Keylab 88 low LCD display light/button lights

Hi there!
My well used Arturia Keylab 88 now has very low light on the lcd and on the buttons. I have opened it up and fixed dead keys before but this seems to be a PSU issue??? Powered by USB connected directly to tower, no problems until today

plug in a 5V 500ma power supply and see if the lights brighten. USB power only is highly stretched considering all the lights on this unit.