TSG: Pen display doesn't show anything
NO SIGNAL
If you turn on your pen display and see a NO SIGNAL message, then this is a different kind of problem. Instead go here: TSG: Pen display shows NO SIGNAL message
Ensure your computer actually detects the display
Does your computer detect the display in the tablet? Check your operating system's display settings. More here: TSG: Computer does not detect the display
Check if the backlight is broken
If your computer does detect the display, but you still see only a black screen, shine a flashlight at your tablet's screen and see if you can detect faint traces of the image your computer is sending. If you do, that means the backlight is broken.
Unfortunately this is not an easy or cheap thing to repair. Most people simply get a new tablet, or if it is under warranty, have the tablet replaced.
Check if the display works with another source of display signal
For example, connect it to another computer, Xbox, or DVD player. If you see something, that tells you the pen display is capable of showing an image and that the problem is somewhere else. More here: DIAG: Checking if a pen display shows an HDMI video signal from other devices.
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