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Why is replacement keyboard malfunctioning?

I have replaced the keyboard and keyboard backlight on this machine. The backlight comes on.

BUT, now the replacement keyboard will not register most letters and numbers. Many keys will cause a system clunk sound when pressed.

I have to connect an external keyboard to log into my account. Since the keyboard will not register letters properly, I cannot do CMD-OPT-P-R + Power Button to reset the NVRAM, of start with D held down for hardware test.

Is it possible that the keyboard requires a different firmware version than the one on the machine? This machine is running OSX 10.5.8 (I have not upgraded because I have a ton of costly software on it. One 3D modeling and rendering package is not in existence anymore. It is a good program, so no upgrade to OS)

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Soluzione Prescelta

Reseat your keyboard cable, see step #18 of this guide. I use a piece of electrical tape on the cable to pull it into the slot rather than trying to push it in. Be aware of how the lock works before doing this.

MacBook Pro 15" Unibody 2.53 GHz Mid 2009 Upper Case Replacement

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I opened up the case and found the keyboard cable at a slight angle in the slot.

However, reseating it and closing the case up and starting showed no improvement.

Using electrical tape on the ribbon cable to seat it in the socket was a great

suggestion. The socket has a lever that has to be released to allow insertion

of the end of the cable. The lever is pressed back down into place when the

cable end is inserted properly. Attaching this cable IS difficult. I initially

had put a bit of a bend in it to get some pressure on it to get it guided into

place in the connector. I am aware that bending a ribbon cable is NOT a

good idea, but it seemed the only way to get some push on it in the direction

of seating.

There is another issue with the keyboard itself which may or may not be

important: There are 51 SHORT, TINY screws holding the keyboard onto

the top case. I managed to loose 2 of the screws. One may still be logded

inside of the exposed cavities inside the keys. Don’t know if I was able

to get it out by turning the machine over and bumping it against my towel

covered work table.

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Those screws are very easy to loose and may attach to your magnetic tools, lid magnets or even the mag-safe port. Leaving a couple out is no big deal.


Yes, one got loose and under the right speaker unit. So I had to take the speaker

unit out to retrieve it. One fell off onto the carpeted floor, but I found it when

I took my left shoe off and shook it out of the shoe. I have learned the virtue of

devout patience from programming, and other hardware fixes. I think I should

get some browny points for being 70 years old and having had cataract surgery

in both eyes last year. I used to have a Ti powerbook. It took about 5 seconds

to replace the keyboard and the replacement, as I remember, was under $100.

Why has Apple gotten so mercenary? I miss the Ti powerbook.


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jekillen sarà eternamente grato.
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