Where a can buy the water filter of Refrigerator LG model LSC26905TT

Sounds like the dual solenoid water control vave. Located in the back it will have two wire connectors going to solenoids. They are replaced as a pair and most local appliance dealers have universal replacemants. http://www.lg.com/us/refrigerators/lg-LSC26905TT-side-by-side-refrigerator

You can buy a service manual here. Service Manual LSC26905TT LSC26905TT

Juan, check out the sear parts direct website for diagrams and replacement parts! See: http://www.searspartsdirect.com/partsdirect/part-number/LG-Parts/Refrigerator-Parts/5007JA3007B/0046/795/Model-LSC26905TT/3204/0165000?keySuffixId=&pathTaken=partSearch&pathRender=modelComponent&documentCompId=50031613&diagramPageId=00004&productTypeId=&searchModelNumber=LSC26905TT&subCompDesc=Refrigerator%20compartment&brandDesc=LG&modelDesc=REFRIGERATOR&blt=11&shdMod=&keyId=611E

Probably water reservoir is leaking. It or tubing going to it probably is cracked.

http://www.searspartsdirect.com/partsdirect/part-model/LG-Parts/Refrigerator-Parts/Model-LSC26905TT/3204/0165000/50031613/00005

The plastic water hose hanging in the back outside of my LG refrigerator that connects to the main water pipe has many little, tiny holes. I tried to change the hose but I couldn't find a way to take the old hose out to switch it with a new one. Will you please give me some directions how to do it. Thanks.

See if it works when you pull the filter out and try running it (without the filter in). If it works, try buying a new filter and make sure you have the filter that is made for your specific refrigerator. If no water comes out or no ice is made after pulling filter out, than you probably have a obstruction in the line. If thats the case you should have someone come out to fix it. If your mechanically inclined you can try to do it yourself. I would suggest reading the owners manual first, in the "troubleshooting" section.

Most refrigerators dont have one, Usually you can install on in the supply line. If there was on it might be behind the frig

locate water filter bracket(normally in fridge compartment), then use screwdriver to remove from the frame. You will see two plastic pipes connected to this bracket. one will be water in and the other water out. pull the two off the bracket and join them together. (be inventive). Connect your RO system to the main inlet after original water supply is removed. Remember, your "filter to be replaced" light will still flash after a period as the fridge has its own software, counting depressions for cartridge replacement. (you would painstakingly have to reset.}

I have bought this fridge yesterday all plugged in working well got nice cold water but its not filling the ice try inside to make ice? Dont know why