Ursprünglicher Beitrag von: Rany ,
If the Wi-Fi signal is weak, it may be the antenna getting disconnected, or being broken. If the Wi-Fi option is greyed out, it is a totally different story. The Wi-Fi circuit is damaged. That means the Wi-Fi chip is bad, missing a power line or an enable line; and/or some other components that are also part of that Wi-Fi circuit may have gone bad. Troubleshooting and replacing Wi-Fi related component is hardly a DYI repair. It requires experience, skill, proper tools, and a good understanding of the Wi-Fi circuit. This failure can happen after a drop (Wi-Fi chip is damaged, a pad is cracked, a line goes missing), prior board repair (heat harms the Wi-Fi chip or a pad underneath it), or spontaneously without apparent cause (for example, Wi-Fi chip dies).