The keyboard is held by small spring-loaded tabs at the top (F-key row). Depress these tabs with a flat tool to lift the keyboard and disconnect the ribbon cable. Advanced Access (Motherboard & Fan) To clean the fan or replace the CMOS battery: Remove all screws from the bottom casing. Flip the laptop and remove the keyboard.
The Asus X5DC is notorious for running hot due to its age and thermal paste degradation. asus x5dc repair manual
The X5DC shares a common chassis and disassembly process with other models in the Asus X5D Series (including X5DAB, X5DAD, and X5DIJ). ASUS X5D Series disassembly video and photo guide The keyboard is held by small spring-loaded tabs