Exact same problem and fix. Likely common issue as the backlight flex cable is too long and bent in a way that causes a lifting force on one side of the connector. Mine was tilted at probably 20 degree angle when I pulled the back cover off. Here is a pic
[image|2167544]
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One thing to note on failure is every other function key will be extra brighter than rest of the non dim backlight keys. Connection failure probably gave this rail the power of the dim function key rails.
Exact same problem and fix. Likely common issue as the backlight flex cable is too long and bent in a way that causes a lifting force on one side of the connector. Mine was tilted at probably 20 degree angle when I pulled the back cover off. Here is a pic
[image|2167544]