Lenovo 40221GU Hardware Maintenance Manual page 51

Hardware Maintenance Manual
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4. Carefully detach the LCD panel from the chassis.
Note
Watch out the panel camera on the top two angles of the LCD panel.
5. Place the new LCD panel to the chassis.
Attention
Use an anti-electrostatic cloth to clean the LCD panel before installing
it to the chassis. You may dip a little alcohol if the LCD panel is dirty.
6. Screw back the four screws on the LCD panel.
7. Install the computer cover. Refer to "Completing the installation" .