How do you fix a Hotpoint WD860G washer dryer display light please?

I have a Hotpoint WD860G Washer dryer which is still working but the electric display panel is in darkness how do you get it to display functions to be seen again? I look at the original manual and it says to switch off washer dryer from wall to reset which I tried but its still did not light up display. Any suggestions will be welcome, is there a way of getting behind panel to see if something has come loose? Thanks a million!
Robn