Dell OptiPlex 3090 Ultra, Service Manual

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NOTE: While orienting the monitor horizontally, route the security lock cable to
the right side of the device to avoid any impact to WLAN performance.
Removing the device from offset VESA mount
Prerequisites
1. Follow the procedure in before working inside your device .
Steps
1. Turn off your device.
2. Disconnect the keyboard, mouse, network, power, and display cable from the device.
3. Push the quick release button on the VESA mount.
4. Slide and remove the monitor arm from the offset VESA mount (U/P-series monitor).
NOTE: For E-series monitor, remove the VESA cover.
5. Remove the four screws that secure the offset VESA mount to the monitor.
6. Remove the four holders on which the offset VESA mount is mounted.
Stands 41