HP ProBook 4520s Maintenance And Service Manual page 171

15. Remove the backlight cables (1) from the clip (2) in the display panel.
16.
Turn the display panel upside-down.
WARNING!
backlight to avoid damaging this component and causing exposure to the mercury.
17.
Remove the backlight frame from the display panel.
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The backlight contains mercury. Exercise caution when removing and handling the
Display 161