Before starting, ensure your workspace is clean and well-lit. Gather all necessary tools and materials. Wear an anti-static wrist strap to protect the console's sensitive components from electrostatic discharge.

Lay the console on a flat surface. Carefully remove the top and bottom covers of the PS5 Slim by gently sliding them off. Use a plastic opening tool if necessary to avoid damaging the casing.

Use a Phillips #1 screwdriver to remove the screws securing the internal frame. Carefully lift the frame to access the internal components. Set aside the screws in a safe place.

Locate the power supply unit within the console. Use a Torx T8 screwdriver to remove any screws securing it. Carefully disconnect any cables attached to the power supply before removing it from the console.

Using a multimeter, test the old power supply to confirm it is faulty. If it fails the test, proceed with replacing it. If not, the issue may lie elsewhere, and further diagnosis will be needed.

Place the new power supply unit into the console. Reconnect any cables and secure it with the Torx screws. Ensure all connections are firm and secure.

Reattach the internal frame and replace all screws using the Phillips screwdriver. Carefully slide the top and bottom covers back onto the console until they click into place.

Plug the console back into a power source and turn it on to ensure the new power supply is functioning correctly. Monitor for any unusual noises or behaviors.