Fujitronic Programmable Operation Display UG520H-x - Manual (Page 246)

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5. Remove the two ribbon cables.
Slide the lock with the ribbon cable holding down with your fingers.
* The connector is not removable.
Ribbon cable connector
Slide the lock to release it.
Lock
Ribbon cable
Ribbon cable connector
Lock
Ribbon cable
6. Remove the 6 screws fixing the inside case.
Screws
Screws
Front external case
Inside case
7. Remove the inside case from the front external case.
Take care not leave scratches, fingerprints, or dirt on the display panel.
8. Place the inside case with the display panel side up.
9. Remove the 4 screws fixing the LCD module.
LCD module
Screws
Inside case
7 How to Replace the Backlight Unit