Did you replace the top case or just the keyboard alone?
It sounds like the keyboard ribbon cable connection is not correctly seated on the logic board or something there has been damaged. Can you take some good detailed pictures of the connection and post them.
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== Update ==
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Lets go back to the way the key switches work again as I explained a given lineup of keys carry a common line (X-Y). These lines then go into a chip called a AD converter (Analog to Digital). As it turns out this one chip also has a USB interface and some other logic to program it.
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So in your case (and the others) the line that goes into the chip has become damaged (servicing the column 7, U, J, & M keys).
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How? I can't say for sure, most of the time these kind of issues are related to spillage or damage to the the keyboards kapton circuit board ribbon connector to the keyboards logic.
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Other possibilities can be something dropped across the keys breaking them or a swelled battery pressing the keyboard shorting it out.
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The keyboards (top case) I end up replacing most of the time (90%) have had spill damage. Everything from coffee, soda, milk and cat pee.
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Older systems that have had issues with the batteries swelling (effecting more keys).
Did you replace the top case or just the keyboard alone?
It sounds like the keyboard ribbon cable connection is not correctly seated on the logic board or something there has been damaged. Can you take some good detailed pictures of the connection and post them.
+
== Update ==
+
+
Lets go back to the way the key switches work again as I explained a given lineup of keys carry a common line (X-Y). These lines then go into a chip called a AD converter (Analog to Digital). As it turns out this one chip also has a USB interface and some other logic to program it.
+
+
So in your case (and the others) the line that goes into the chip has become damaged (servicing the column 7, U, J, & M keys).
+
+
How? I can't say for sure, most of the time these kind of issues are related to spillage or damage to the the keyboards kapton circuit board ribbon connector to the keyboards logic.
+
+
Other possibilities can be something dropped across the keys breaking them or a swelled battery pressing the keyboard shorting it out.
+
+
The keyboards (top case) I end up replacing most of the time (90%) have had spill damage. Everything from coffee, soda, milk and cat pee.
+
+
Older systems that have had issues with the batteries swelling (effecting more keys).
Did you replace the top case or just the keyboard alone?
It sounds like the keyboard ribbon cable connection is not correctly seated on the logic board or something there has been damaged. Can you take some good detailed pictures of the connection and post them.