My computer does not detect the microphone. When I opened the laptop, I discovered that the sub-board was missing screws, and the keyboard had been replaced by plastic welding (the keys came loose because it was not secure). On the board, I found that a part of it was broken (I am not sure whether it was broken by the person who replaced the keyboard or if the loose keys caused the damage, but I could not find the broken piece inside the laptop). In the broken area, I saw some circuit traces, but I am not sure where they were connected to. If anyone has this board, could you please help me identify...