Temprature blinking
Control board has gone bad....
What happens is the defrost is controlled electronically from a circuit board, when this goes bad, the freezer quits defrosting, and freezes the fans that circulate air through the fridge side of things.
To check this, unplug the entire fridge, leave the freezer open, wait for it to defrost a bit, if this causes the fridge to start cooling again when you plug it back in, then its the defrost. You should also see ice crystals on the back of the freezer just under the icemaker.
http://forums.partselect.com/refrigerator-freezer-repair/rerifgerator-side-not-below-54-degrees-6699.html
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