Actually. this is my second time opening it up. The first time I open it up due to smart reader not working properly. I wanna save the repair cost so I opened it up. Plug out and plug in the related ribbon/flat cable then all work properly.
This time just wanna clean the edge of the white keys, so I opened it up the second time. I am surprised that the PCB board for the keybed(4th picture) is better than all other PCB board in the keyboard.