Dell L400 service manual

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2.Remove the keyboard bezel.

3.Remove the display assembly.

4.Remove the display assembly bezel.

5.Remove the four M2 x 3.5-mm screws on the left and right sides of the display assembly that secure the LCD panel to the top cover (see Figure 11).

6.Remove the M2 x 3.5-mm screw that secures the inverter to the top cover.

7.Lift and roll the inverter over (toward you), so the bezel side is down and the connector side is up (see Figure 11).

8.Disconnect the narrow flex cable from the ZIF connector on the left side of the inverter.

9.Disconnect the two-wire back-light plug from the connector on the right side of the inverter (see Figure 11).

10.Remove the inverter.

11.Lift the LCD panel from the bottom edge, giving enough room to fit your hand between the LCD panel and the top cover.

12.Carefully peel the LCD flex cable away from the top cover.

13.Lift the LCD panel out of the top cover.

14.Lift up on the tape that is covering the wide flex-cable connector on the back of the LCD panel.

NOTE: Keep the tape for when you replace the LCD panel.

15.Disconnect the wide flex cable from the connector on the back of the LCD panel.

To replace the LCD panel, perform the following steps:

1.Connect the LCD flex cable to the connector on the back of the LCD panel.

2.Reinstall the tape that covers the LCD flex-cable connector on the back of the LCD panel.

3.If you are installing a new LCD flex cable, peel off the backing tapes that are on the LCD flex-cable EMI sponges.

4.Reinstall the LCD panel in the top cover.

a.Holding the LCD flex cable against the back of the LCD panel, insert the right edge of the LCD panel into the right end of the top cover.

The right edge of the LCD panel should press against the EMI sponge on the right side of the top cover. The LCD panel should not rest on top of the EMI sponge.

14 Dell Latitude L400 Service Manual

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Contents Dell Latitude L400 Page Contents Tables Dell Latitude L400 Service Manual Recommended Tools Screw Identification and Tightening Display Assembly ZIF Connectors Removing Field-Replaceable Parts and Assemblies Hard-Disk Drive Assembly Hard-Disk Drive Assembly RemovalKeyboard Bezel Keyboard Bezel RemovalDisplay Assembly Display Assembly RemovalPage Display Assembly Bezel Display Assembly Bezel RemovalDisplay Assembly Latch Display Assembly Latch RemovalLCD Panel ZIFPage Display Assembly Hinges Keyboard Assembly Keyboard Assembly RemovalSupport.dell.com Memory Module Memory Module RemovalPalmrest Assembly Removing the Palmrest Assembly Bottom ScrewsRemoving the Palmrest Assembly Top Screws Touch Pad Assembly Touch Pad RemovalBottom Assembly Bottom AssemblyReserve Battery Main BatteryModem Modem RemovalFan Fan RemovalPage Speaker Speaker RemovalPage System Board Assembly System Board Assembly RemovalPage Hard-Disk Drive EMI Clip Main Battery Release Latch Main Battery Release Latch RemovalAPR Docking Doors Page Index
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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.