I know this is similar to the previous posting but mine is controlled by a CPU. My freezer is working and there is frost in it but not on the back panel which is what I was told to look for a faulty defrost unit. The upper fridge part is warm with no air coming in. I was wondering if I should replace the CPU or should I look for something else?

Yes the fan is running non-stop.

Could not find a manual for your unit but here is one for the LRFC series.
Hopefully will be close to yours
http://appliancejunk.com...nloads;sa=downfile;id=48

If the evaporator coils are clear of ice. It sounds like you have a problem with the damper which controls the amount of cold air which is blown into the fresh food section.

So after having the technician out to the house and looking at the unit I figured out that all they do is call up the manufacturer and they do the diagnosis over the phone and tell them what parts for me to buy. So after all of that they told me that I had to replace the damper assembly and the main cpu, which both together were over $200 and labor would be over $200. He also told me about a reset button on the cpu board that you can push and it goes through all the checks. Sure enough after I reset the button my fridge started getting cold air into the refrigerator area again. Problem fixed? I thought so but then after a night my water froze in the door dispenser and all my liquid goods in the refrigerater started to freeze. So the damper control is still broken. So instead of buying the parts needed I just upped the freezer temp from 0° to 8° and water came back in the door and all liquid items in the fridge area thawed out. Everything is cold and everything works but the fridge is still broken. So its fixed in my book and has been working for a month so far.