Screen is dark - Sony KDS-60A2000 60" HDTV

What exactly do you mean by "dark screen"? Is there a normal picture but its dark, or parts of the screen have a good pic and some areas are dark?

If Picture mode is set to Cinema or Custom, the screen may become dark. If the screen is still dark after the picture quality mode is changed, change the setting Backlight, Picture, Brightness and adjust the brightness to your taste. ... If Power Saving is set to Low or High, the screen becomes dark
https://www.sony-mea.com/en/electronics/support/articles/00024643

If your TV has already fully adjusted in brightness set up?, and there will be no good picture results?...try to adjust the "SCREEN-Screw" at the flyback slowly. If the picture still dark'?. the picture tube has need to rejuvenate.

Then You might have an Inverter Problem or the back light lamps are going bad.

try to ,change this

sony dsc-w110 dark screen

The backlight has went out on your screen. I had this happen on an old laptop I was messing with. Check the link below for some tips.

DARK SCREEN

Use brighten controls on monitor to lighten

reset your monitor settings with deafaults with menu.u see some buton on lcd or monitor.