Thinkpad T420 speakers are known to be defective and do not work properly. There are several reasons why this might be the case. One potential issue is that the speakers might be defective. This can lead to them not working properly, or even not being able to produce sound at all. Another potential issue is that the audio input on the laptop might not be working properly. This could be due to a damaged or missing audio jack, or it could be due to a problem with the audio circuitry on the laptop itself. If the audio jack is damaged, it might be difficult or impossible to get it repaired. If the audio circuitry on the laptop is damaged, it might be difficult or impossible to get it replaced. In either case, the speakers might not work properly as a result. Fix Sound Issue Of Lenovo laptop If your Thinkpad T420 speakers do not work, there are a few things you can do to try and fix the issue. (1) First, make sure that the speakers are plugged into the computer and that the audio drivers are up to date. (2) If...