Fujitronic Programmable Operation Display UG520H-x - Manual (Page 267)

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UG220
Do not touch cables and boards that are not associated with backlight
unit replacement. Doing so may result in failure.
1. Turn the backlight unit upside down. Remove the 4 external screws.
Place it on a cloth, etc. to protect the display panel from scratches.
2. Remove the rear external case.
3. Disconnect the backlight unit (CFL unit) connector.
Hold the connector and pull it out. Do not twist or yank on the cable
then
UG220 backlight unit replacemect.
Rear external case
Screws
Backlight unit (CFL unit) connector
Front external case
Rear external case
7 How to Replace the Backlight Unit