Lenovo ThinkPad T420 Hardware Maintenance Manual page 12

DANGER
If the LCD breaks and the luid from inside the LCD gets into your eyes or on your hands, immediately wash
the affected areas with water for at least 15 minutes. Seek medical care if any symptoms from the luid are
present after washing.
DANGER
To avoid shock, do not remove the plastic cover that protects the lower part of the inverter card.
DANGER
Though the main batteries have low voltage, a shorted or grounded battery can produce enough current to
burn personnel or combustible materials.
DANGER
Unless hot swap is allowed for the FRU being replaced, do as follows before removing it: power off the
computer, unplug all power cords from electrical outlets, remove the battery pack, and disconnect any
interconnecting cables.
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ThinkPad T420 and T420i Hardware Maintenance Manual