To upgrade your Lenovo ThinkPad T420, you can consider upgrading the RAM to improve performance. The T420 supports up to 8GB of DDR3 RAM. You can also upgrade the storage by replacing the hard drive with a solid-state drive (SSD) for faster read and write speeds. Additionally, you can consider upgrading the operating system to a newer version for improved security and features. **

No, the RAM on the Lenovo ThinkPad T420 is not soldered. The T420 has two RAM slots that can support up to 8GB of DDR3 memory per slot, allowing for a maximum of 16GB of RAM. This means that the RAM can be easily upgraded or replaced by the user, providing flexibility for future upgrades or repairs. **

Yes, Minecraft can be played on the Lenovo ThinkPad T420. The ThinkPad T420 has a decent processor and graphics capabilities that can handle running Minecraft smoothly. However, the performance may vary depending on the specific configuration of the laptop and the settings used in the game. It is recommended to ensure that the laptop meets the minimum system requirements for Minecraft to ensure optimal gameplay experience. **

The Lenovo T420 has a built-in wireless network card that allows it to connect to Wi-Fi networks. To use the wireless function, you simply need to turn on the Wi-Fi switch located on the front edge of the laptop. Once the Wi-Fi is turned on, the laptop will scan for available wireless networks and display them in the network connections menu. You can then select the network you want to connect to and enter the password if required. Once connected, you can access the internet and other network resources wirelessly. **

The main differences between the Lenovo T420 and the T420s are: 1. Size and weight: The T420s is thinner and lighter than the T420, making it more portable and easier to carry around. 2. Display: The T420s has a higher resolution display compared to the T420, providing better image quality and clarity. 3. Performance: The T420s typically has a more powerful processor and better graphics options than the T420, resulting in better overall performance. 4. Battery life: The T420s generally has a longer battery life compared to the T420, allowing for more usage time on a single charge. Overall, the T420s is a more premium and high-end version of the T420, offering better performance and portability at a higher price point. **

You can buy an illuminated keyboard for the ThinkPad T420 from various online retailers such as Amazon, eBay, or Newegg. You can also check with Lenovo's official website or authorized resellers for the specific keyboard model compatible with the ThinkPad T420. Additionally, you may find illuminated keyboard options at local computer hardware stores or electronics retailers. **

To upgrade the graphics card in the ThinkPad T420, you would need to first check if the graphics card is integrated or dedicated. If it is integrated, it cannot be upgraded as it is part of the motherboard. If it is dedicated, you would need to open the laptop and locate the dedicated graphics card. You would then need to find a compatible replacement graphics card and carefully install it, making sure to update the drivers and BIOS as needed. Keep in mind that upgrading the graphics card in a laptop can be complex and may void the warranty, so it's important to research and proceed with caution. **

Yes, the WLAN cable of the T420 ThinkPad WLAN card can be replaced. However, it is recommended to have it replaced by a professional technician to ensure proper installation and functioning of the WLAN card. Attempting to replace the cable without proper knowledge and tools may result in damage to the device. **