The keys: 9 / O / L / . are not functioning. all surrounding keys work for except these 4 keys
is there something locked or is there a function key i can press to make them work?
These keys share a scan line in the keyboard. There is a break in the scan line or a bad connection between the keyboard panel and the controller circuit board inside the keyboard (or the motherboard in a laptop computer). Most keyboards use a pair of flexible plastic sheets with the scan lines printed in silver ink. These are attached to the controller with a "flexible printed circuit" connector. Sometimes the material tarnishes where it makes its connections there and the keyboard fails as you have described.
Most of these connectors have a friction lock that is disengaged by sliding it about 1 mm along the length of the flat ribbon cable going into the connector (there is a stop at this point - do not force the lock past it). The lock looks like a frame around the top of the connector box and has a slot for the cable. Once the lock is disengaged, the cable will slide out. Now you can clean the contacts on the cable (both sides) by polishing them with a white pencil eraser. When that is done, seat the cable back in the connector and push the lock back in until it makes a soft click or bottoms out on the connector shell. Once in a while there will be a connector that is friction fit - there will be no lock, but the cable will have a stiff reinforcing sheet attached to it. Very rarely, the lock will be a flip-up tab on the side of the connector - these are usually used only on smaller, narrower ribbons.
Avoid touching the circuitry on the controller board - it is easily damaged by static electricity.
If this doesn't work, you'll probably have to replace the keyboard.
Jan 06, 2011 |
Dell 0Y3740 Keyboard