HP TC4400 - Manual (Page 201)

Display Component Recycling
Maintenance and Service Guide C–13
19. Disconnect the display cable 1 from the LCD panel.
20. Remove the screws 2 that secure the LCD panel to the
display rear panel.
21. Release the LCD panel 3 from the display rear panel.
22. Release the tape 4 that secures the LCD panel to the display
rear panel.
Releasing the LCD Panel