Lenovo IdeaCentre B305 - Manual (Page 57)

Chapter 8. Replacing hardware
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7. Disconnect the LED cable from the LED panel.
8. Remove the shell. Refer to “Removing the shell”.
9. Remove the 6 screws that secure chassis to the front bezel.
10. Pull the pins to release the chassis from the front bezel.
11. Place the computer upside down and separate the chassis from the
front bezel.