Fujitronic Programmable Operation Display UG520H-x - Manual (Page 237)

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16. Remove the backlight unit (CFL unit) by pulling it up.
Cover
LCD module (rear)
Backlight unit (CFL unit)
17. Attach a new backlight unit (CFL unit).
When taking a new backlight unit out of the bag, do not twist or yank on
the cable.
18. Attach the cover.
* Insert the cover in a slanting direction (as shown with arrow (1)), and slide it to the direction of arrow (2)
until it is hooked on claws.
19. Attach the screw fixing the cover.
* Since the screw is small, use a precision screwdriver to attach it.
Cover
LCD module (rear)
(1)
(2) Cover fixing screw
Claws
7 How to Replace the Backlight Unit