Make sure you have loaded the latest graphics drivers using below links:
Before you install video drivers, try uninstalling any Intel(R) Graphics Driver from windows control panel.
I've already performed this step many times now, unfortunately without success.
As I wrote earlier, the backlight starts, just as most screens when they wake up. However, I'm not getting any graphical output at all. Do you think it may be a BIOS setting? Or maybe a power setting?
BIOS or power settings within windows control panel might be an option; however, I am not familiar with your Tablet model. You need to contact your Tablet manufacturer for further instructions.
I also recommend getting customized drivers from the tablet maker as the graphics driver engine may be different from our versions.