I have a clamshell iBook which has a keyboard on which quite a large number of keys are not working.
I took the key caps off to have a look what kind of electronics are underneath but I'm puzzled by how it works.
There is a silicone mat with little bubbles that sit underneath the keys and that lift the key up when it's released.
There doesn't seem to be any conductive part in the silicone that would close any kind of circuit.
Underneath the silicone there is a blue dot, which, when I touch it with my bare finger, causes a key stroke.
There are some keys which don't have these blue dots though, in other words, the silicone bubble presses down on a metal part of the keyboard.
So how does this all work? And how can I get the non working keys to work? I tried cleaning the dots and the metal bits as well as the silicone, but it hasn't made a difference.
The ribbon cable doesn't seem to have any broken traces, but I can only access on e side of the contacts, so I can't measure for continuity as the other side is hidden inside the keyboard.
Does anyone have any tips on this?
I took the key caps off to have a look what kind of electronics are underneath but I'm puzzled by how it works.
There is a silicone mat with little bubbles that sit underneath the keys and that lift the key up when it's released.
There doesn't seem to be any conductive part in the silicone that would close any kind of circuit.
Underneath the silicone there is a blue dot, which, when I touch it with my bare finger, causes a key stroke.
There are some keys which don't have these blue dots though, in other words, the silicone bubble presses down on a metal part of the keyboard.
So how does this all work? And how can I get the non working keys to work? I tried cleaning the dots and the metal bits as well as the silicone, but it hasn't made a difference.
The ribbon cable doesn't seem to have any broken traces, but I can only access on e side of the contacts, so I can't measure for continuity as the other side is hidden inside the keyboard.
Does anyone have any tips on this?