Big Sur Motherboard Replacement

Disconnect network cables from the front of the Big Sur

Then release the two locking levers on either side of the Big Sur

Pull the Big Sur out until the rear of the chassis clears the support rail above

Unscrew the 2 locking screws on the front of the server

Pull the cover straight forward to disengage the anchor pins. The cover will move only about 1/2". Then Lift and remove the cover. Place in a safe location out of the way from people.

Remove the green air flow baffle by pulling it towards the rear of the unit and then lifting up.

Note the instruction arrows are in the order of install. Reverse for removal.

There are thirteen cables to be disconnected. Each will be shown in detail

Remove the four riser card connections.

Each connector has a push tab. Depress the push tab to release

Also unplug the small cable attached to the large cables shown. It press fits to a white socket and can be removed by gently pulling on the connector.

Remove the two disk connectors on the right side of the board.

Depress the metal tab gently and slide the connector horizontally.

Disconnect both cables by grasping the plastic connector and pulling gently straight up.

Pull the main GPU connector by depressing the top of the locking clasp and pulling the sides of the connector.

Remove the smaller black connector. It too has a small locking clasp. Depress the clasp and pull the connector housing straight up.

Remove the two final connectors at the rear of the board by depressing the locking claps and pulling upwards

Loosen the screw anchor connecting the PCI board to the front of the chassis. The screw is designed to be loosened by hand but a Phillips screwdriver may be required.

Loosen the two anchor screws at the rear of the board.

The screws should not be removed entirely. Loosen only until they are not connected to the chassis.

Ensure all of the disconnected cables are out of the way.

Gently pull back and up on the handle to disengage the front panel connectors and free the board.

If you need to move the memory and CPUs from the original motherboard to the replacement. Do that now.

The Leopard for Open Rack V2 guides describe CPU and memory replacement. The Big Sur layout is different but the procedure is the same.