9.Follow the following sequence to install the four screws to secure each new heat sink and fan assembly. Do not over-tighten the screws.

a.Partially tighten screw

b.Partially tighten screw

1 , then fully tighten screw

3 , then fully tighten screw

2 , and then fully tighten screw

4 , and then fully tighten screw

1.

3.

10.Connect the heat sink and fan assembly cables to the microprocessor fan connectors on the system board. See “Locating parts on the system board” on page 58.

What to do next:

To work with another piece of hardware, go to the appropriate section.

To complete the installation or replacement, go to “Completing the parts replacement” on page 104.

Replacing the hard disk drive fan assembly

Attention: Do not open your computer or attempt any repair before reading and understanding the “Important Safety Information” on page 1.

This section provides instructions on how to replace the hard disk drive fan assembly.

To replace the hard disk drive fan assembly, do the following:

1.Turn off the computer and disconnect all power cords from electrical outlets.

2.Remove the computer cover. See “Removing the computer cover” on page 64.

3.Disconnect the hard disk drive fan assembly cable from the system board. See “Locating parts on the system board” on page 58.

4.Remove any parts that might prevent your access to the hard disk drive fan assembly. Depending on your computer model, you might need to remove the PCI Express x16 graphics card for easier access to the hard disk drive fan assembly. See “Installing or replacing a PCI card” on page 66.

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Lenovo 4229, 4223, 4228 manual Replacing the hard disk drive fan assembly

4229, 4223, 4228 specifications

Lenovo has long been recognized for its commitment to producing high-quality computing solutions, and the ThinkPad line is no exception. Among its various models, the Lenovo ThinkPad series 4228, 4223, and 4229 stand out for their robust features and reliable performance, making them ideal choices for business and professional use.

The Lenovo ThinkPad 4228 series is engineered with a focus on durability and performance. One of its key features is the powerful Intel Core processor range, which ensures that users can manage demanding applications and multitask efficiently. Alongside this, the device typically comes equipped with ample RAM, providing speed and responsiveness that enhances productivity.

Moving to the ThinkPad 4223, it streamlines user experience with advanced connectivity options. The inclusion of multiple USB ports, HDMI, and Ethernet capabilities allows for seamless integration with various devices and networks. The 4223 model often houses a backlit keyboard, enabling users to work effortlessly in low-light environments. This model puts a strong emphasis on portability, making it a reliable companion for professionals on the move.

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All three models in the 422x series boast Lenovo’s robust security features, including fingerprint readers and TPM (Trusted Platform Module), which safeguard sensitive data against unauthorized access. Furthermore, the reputation of Lenovo ThinkPads for their exceptional keyboard layout ensures that users can type comfortably over extended periods, reducing strain and increasing efficiency.

In summary, the Lenovo ThinkPad 4228, 4223, and 4229 models represent a blend of power, durability, and user-friendly design. With their focus on connectivity, performance, and security, these laptops cater perfectly to the needs of professionals and businesses, confirming Lenovo's status as a leading manufacturer in the world of computing technology. Whether you need a rugged workhorse for heavy tasks or a portable device for meetings, the ThinkPad series provides versatile solutions to meet any requirement.