Your water filter, if you have one installed, is located in the light housing of the top shelf. It is easiest to take your food off of the top shelf and remove the shelf to get easy access to it. I normally place a towel under it to catch any drips. If you do not see the canister hanging down then the bypass is likely installed. This is not a filter and can be used if no filter is desired. The "change filter" light will go off after a certain amount of time, or usage regardless if the filter,or bypass is installed.
That model number looks more like an item number. LG usually has a rather long model number.. The panels are typically held in by snap clips and can be tough to release! I look for any hole to get a small hook into and start pulling! It will be tough and will seem like it is gonna break but I haven't done any damage removing one yet.
It is uncommon for the fan motors to fail. They have an issue with interior moisture that will cause the fan to stop after it is built up with frost but will work once thawed. Please look at the model sticker inside the unit and provide that number for further assistance.
First, I'm not a LG Technician. Call your LG vendor for service.
*** the following is for information only. ***
* Move food items to another refrigerator.
* Do a complete DEFROST of the box. (unplug it.) Expect it to take 4 or more hours. You must wait till all water stops dripping out of the fridge. Keep checking the lower defrost drip tray at bottom of fridge. Dump out water from tray as needed. DO NOT you a hair drier or any other heat source! The heat will warp the plastic. Use a small fan to gently blow into the freezer section.
* DO NOT use an ice pick or sharp object to remove ice! Just let everything melt. (The problem of ice is inside the coils)
* Plug in Fridge but don't put any food in. Set dial temperature to the Mid range setting. Set to freezer venting to normal. Set the refrigerator to mid range. Let it cool down to 0 - 10 degrees and start making ice (in ice maker) If it does not cool down to at least 10 degrees F then call for service. Suspect bad thermostat, Blocked condenser coils, Bad pump, etc. Qualified service tech required to repair.
* Cooling okay? Reload food but don't stuff it in. Leave space between the walls to allow cold air to flow around foods. It will take a day or so to cool down food properly. Note: I may take longer if this fridge is near a heat source like a Hot water heater, Oven, Range, Steam radiator, etc.
* If your still icing up in 2-3 weeks. Then check if the coils are icing up. Defrost is not working. This needs to be checked by a tech. Have him perform annual maintenance.
* Check door seals. Kids leaving the door open? High humidity? * Note how everyone uses the fridge; are they putting hot food in it? Open hot steaming food adds heat and humidity to fridge. Hot food with thaw out other frozen food and build up frost.
* Final, Have a Tech check your fridge. Have them perform maintenance and replace worn items as needed.