Solved! my Lenova laptop goes to sleep mode but screen light still stays on

Try this...

1. Go into "Control Panel" and click the "Power Options".
2. Next to the plan that is currently selected click "Change Plan Settings".
3. Now click "Change Advanced Power Settings".
4. Open the "Sleep Setting" and check the settings for all things in there. Making sure they are set to turn the display off.
5. You may want to check other areas as well to make sure nothing else is interfering.