The volume control still works even if the screen is locked.
Philips Support
How to lock the screen of my Philips MP3 player?
Published on 2017-08-24
Accidental activation of the touch controls of your Philips MP3 player can be prevented by locking the screen. To lock/unlock the screen, press Power/Lock button.
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For convenience, automatic screen lock can be set. The screen dims and is automatically locked after a set period of time. Follow the steps below to set auto screen lock: 1. From the Main Menu, go to Settings 2. Select Display settings 3. Choose Screen off timer and set the time To disable automatic screen lock, set the time as 0 min.
