Fujitronic Programmable Operation Display UG520H-x - Manual (Page 263)

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4. Remove the three ribbon cables.
Ribbon cable connector
Ribbon cable
Slide the lock to release it.
Lock
Ribbon cable
Ribbon cable connector
Lock
Slide the lock with the ribbon cable holding down with your fingers.
* The connector and the lock are not removable.
5. Remove the 4 screws fixing the CPU board.
Screws
CPU board
6. Raise the CPU board vertically until it is removed.
Take necessary measures to protect the CPU board from static electricity.
Screw
Screw
Insulating seal
Connector
Inverter board
7. Remove the 2 insulating seals from the inverter board.
8. Remove the connector from the inverter board.
7 How to Replace the Backlight Unit