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Introduction |
| If your Lenovo T420 needs a new keyboard or is running hotter then you think it should, this guide will show you how to remove the keyboard from the system to gain fan access, or replace a faulty or worn out keyboard. | | '''Guide notes''' | | * If you are removing the keyboard for fan access, blowing too much air into the heatsink in one shot (or being too close) can damage the fan. If the damage is particularly severe the system will give you a fan error and shut off to protect the processor (and dGPU, if equipped). If the system says '''Fan error''' when it is rebooted, the fan is damaged and will need to be replaced and the system will refuse to boot past this error. Use extra caution if you suspect the fan is failing prior to cleaning the heatsink. The fan in the author's system was rattling before I cleaned it and the issue has not come back since. '''If the fan ends up getting damaged, this is NOT your fault; all you did was reveal the system needs a new fan.''' | | * If you are replacing the keyboard, check the Lenovo HMM to determine what keyboard you need. This can also be found on the back of your old keyboard as well. | * While this is not a hard repair, you may wish to sort your screws. Losing the silver screw under the RAM door is can be a fatal mistake. | | * Watch the ground on the chassis by the RAM door. This can get in the way or come loose from the chassis. If this happens push it back into place and it'll be almost as good as new. |
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