Just found my fridge door left open all night with a ton of meat

My problem was similar to yours and my lg refrigerator model number is: LMXS30776D/02, I followed the steps like you with no luck. I just fixed mine last night and it's a pleasure for me to share with you my experience.As I was trying to figure out what was wrong with my fridge, as I was shaking and lifting the left front door of my fridge I noticed that the error code E: 15 disappear on the display. As we open the door back and forth for normal use,the error E: 15 comes back again.From that,I realized something wrong with the left front door of the fridge. I ordered a new left door, It came in yesterday, I installed it last night and everything works beautifully in my fridge, no more code what so ever. as a result, if you are experiencing the same problem,most likely you need to think replacing the left door of the fridge.
Let me know if this help.
Thank you.

Look at the door on the ice cube chute. If there is a cube stuck in it holding it open, ice will form on interior surfaces of the freezer. The door flapper must close tightly.

Is the fan in freezer compartment working? Is the damper fully open to allow cold freezer air into fridge section?

It sounds like the thermocouple has gone faulty. This is part of your temperature control system. Best to have it checked out by an appliance repairman. Good luck, Dana

I will help but you need to confirm your model number. Is your model the one listed above your post? Let me know, Sea Breeze

Hi,
Shut down the fridge for 10 - 15 Minutes and leave the fridge door open, and push the Defroce button
ANd start the fridge again and after some time check the temp.+ after some time.

Thanking you,
Your Tech Support
Manish Shirsikar,
Fixya.com

I turned the fridge side off on mine, and left it overnight (last night!). This morning there is frozen stuff in the freezer. I think the compressor motor just needed ALOT of time to cool down b4 it would work properly again

After looking at some advice from others I turned the internal dial to the OFF position, then turned it back to 6 or 7, and left it for 20 minutes, and it is now freezing again.

turn it off for a day or two let it defrost and then turn it on. it just has frozen up the coil, or the compressor has heated up cause it was working to hard turn it of for a cople of hours to let the compressor cool