NO LIGHT IN THE MAIN SCREEN OF MY GC 7890A

Hi

Try to restart instrument.If light came then okay..

Otherwise u have to contact your local agilent support..

I have a doubt that cable connected with display inside keyboard panel loose or board issue..

Dear rogermoise!

I've had the same problem with an another 7890A GC. The logic board needs to be replaced and it solved the problem.

But to be sure contact your local agilent support.

All the best!