NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.

NOTICE: The processor is not replaceable. Do not attempt to remove the thermal cooling solution.

1.Remove the keyboard bezel.

2.Remove the display assembly.

3.Remove the keyboard.

4.Remove the palmrest assembly.

5.Use a 5-mm socket wrench to remove the four 5-mm socket screws for the VGA and parallel ports located on the back of the bottom case assembly.

6.Use a small flat-blade screwdriver to remove the two IDE connector screws at both ends of the IDE (modular bay) connector located on the back of the bottom case assembly.

NOTICE: To ensure maximum cooling for the microprocessor, do not touch the glue side of the thermal conductive tape. The oils in your skin reduce the heat transfer capability on the glue side of the tape.

7.Peel up the EMI adhesive sponge that connects the audio EMI shield to the thermal cooling solution (see Figure 22).

You only need to peel up the part of the sponge that lays on the thermal cooling solution. The end of the sponge that lays on the audio EMI shield can remain.

NOTICE: The audio EMI shield is attached to the USB connector housing with two-sided tape. To avoid bending the audio EMI shield, care must be taken when separating the audio EMI shield from the USB connector housing.

8.Using a small flat-blade screwdriver, carefully separate the audio EMI shield away from the USB connector housing.

Place the edge of the screwdriver between the audio EMI shield and the USB connector housing, and slowly pry the two apart.

9.Remove the two M2 x 4-mm screws that secure the audio I/O cover to the bottom case assembly.

10.Remove the audio I/O cover.

11.Remove the six M2 x 3.5-mm screws that secure the system board to the bottom case assembly.

White arrows on the system board assembly point to the M2 x 3.5-mm screws.

12.Remove the M2 x 9.5-mm screw that secures the modem retainer bracket.

30 Dell Latitude L400 Service Manual

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Dell L400 service manual
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L400 specifications

The Dell L400 is a notable laptop that emerged in the late 1990s, specifically designed for business professionals and mobile users. This portable computer was celebrated for its lightweight design and solid performance during an era when mobile computing was starting to gain traction.

One of the key features of the Dell L400 is its compact size. Weighing in at just around four pounds, it was easy to carry, making it an ideal choice for users who needed to travel. Its 12.1-inch display was a notable aspect, featuring an active matrix screen that provided decent visual clarity for its time, thus enhancing the mobile computing experience. The display, although small by today’s standards, was designed for convenience and portability, balancing screen size with overall weight.

The L400 was powered by Intel's Pentium III processor, which delivered respectable performance for everyday tasks such as word processing, spreadsheets, and basic multimedia applications. This made it suitable for professionals who required a reliable device for work-related activities without the latest specifications of modern laptops. Additionally, it commonly featured between 64 to 128 MB of RAM, upgradeable, which allowed users to run multiple applications smoothly.

Storage options included traditional hard drives ranging from 6 to 20 GB, providing ample space for documents and essential software of the era. While this may seem limited compared to modern standards, it was a reasonable capacity for users at that time.

In terms of connectivity, the L400 integrated essential ports such as USB, parallel, and serial, catering to a variety of peripherals that users often employed. It also included an Ethernet port for network connectivity, which was crucial for business environments. The inclusion of a modem facilitated dial-up internet connections, reflecting the technology landscape of the late 90s.

Battery life was another significant attribute, as the Dell L400 offered decent longevity that allowed users to extend productivity without being tethered to a power outlet. It typically featured a lithium-ion battery that contributed to its portability.

Overall, the Dell L400 stands out as a historical example of early portable computing, marked by its balance of performance, portability, and connectivity. While it may not compete with modern laptops in terms of specifications, its design and functionality marked an important step in the evolution of mobile computing technology.
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