Guys, I need your help. I have an issue with Lenovo T490s laptops – several dozen units in different configurations, and in about half of them, the same problem appeared over time. Specifically, the Enter and Backspace keys don't work unless they are held down for a few seconds or pressed slightly harder than usual. Once they start working, they continue to function until the next reset. However, this is not just a Windows issue – it occurs under other operating systems, in BIOS, and during POST as well.
While searching for information, I found many threads describing the same problem. Some users mentioned that sending the laptops in for warranty repair resulted in Lenovo replacing the entire palm rest (which includes the keyboard), and the issue was resolved. However, some posts also mentioned that the problem returned later.
From the solutions I found online, I've tried key combinations, disabling game mode in Windows, uninstalling the keyboard driver and replacing it with another one. I checked the connector and adjusted the ribbon cable – no success.
Does anyone have an idea how to tackle this? Replacing the keyboard is, of course, an option, but it's quite costly and time-consuming. Besides, are we sure it's solely a keyboard issue? Could it be a BIOS firmware problem? Or perhaps the KBC? Maybe the connections between the KBC and the connector?
While searching for information, I found many threads describing the same problem. Some users mentioned that sending the laptops in for warranty repair resulted in Lenovo replacing the entire palm rest (which includes the keyboard), and the issue was resolved. However, some posts also mentioned that the problem returned later.
From the solutions I found online, I've tried key combinations, disabling game mode in Windows, uninstalling the keyboard driver and replacing it with another one. I checked the connector and adjusted the ribbon cable – no success.
Does anyone have an idea how to tackle this? Replacing the keyboard is, of course, an option, but it's quite costly and time-consuming. Besides, are we sure it's solely a keyboard issue? Could it be a BIOS firmware problem? Or perhaps the KBC? Maybe the connections between the KBC and the connector?