See if the welding module is faulty
Install keyboard. One thing to note here is that you must wait until the alcohol evaporates
?Of course, this procedure applies only to the use of electric iron friends, friends will not use, please skip this step
Check the welding module of non weld or sealing, if you can use the electric iron, can carry out welding work.
Remove the dirt inside the corner of the keyboard, the tool can be used brush, brush, etc., but pay attention to the action to be gentle
