My LG refrigerator Model No: 262QM is leaking water on the floor, don't know if its defrost is not working or some other problem? My refrigerator is around 5 years old.

All that information is available on the manufacturers web site.

Depends on where leak is. If water is ponding in freezer, there will be a sheet of ice on freezer floor. This would indicate a defrost drain blockage. If not that, maybe ice maker or water valve or associated water lines.

Defrost drain is clogged with Ice and debris. Thaw and clear drain.

Just how old your fridge is I don' t know. But is your defrost timer working on your freezer. It should defrost at least once a day. You may want to check out the drain on the bottom of the fridge also. It may be partly clogged up. Then newer models have the coils go over the pan to help evaperate the water.

Evaporator condensate should go to pan for evaporation. If the amount exceeds pan capacity during defrost cycle it could overflow to the floor.

The drain in the freezer behind back lower panel
needs opening. You can see it at the bottom of the back panel
underneath the evaporator coils. (The cold coils)
Run Hot water in the drain until it clears or use a hairdryer.
When the defrost melts the water it goes down the drain
If the drain is clogged with Ice or ? The defrost water
overflows into the ref. or freezer or on floor
Run Hot water in the drain until it clears or use a hairdryer.
Also check fan undernearh Ref in the rear
Clean condenser coils underneath
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Leo Ponder
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Defrost drain is frozen. Poor hot water around it until it is clear. You will most likely have to take inside back wall of freezer off to access defrost drain. While you have it off, inspect metal pan to be sure holes aren't rusted in it. Some are aluminum, but some are steel.

the defrost drain pan is plugged up,you need to defrost it and run a wire down the drain tray hole so it can drain to the bottom as it defrosts otherwise it defrosts and runs everywhere else and re freezes

Is it leaking water INSIDE the fridge at the bottom - if so that is an indication of a clogged defrost drain - if you have a drip cup in your refrigerator, that connects to a tube at the back of your fridge, to carry the water from the defrost cycle down the drip pan at the bottom.

If you see water OUTSIDE your unit, the only explanation is an overflowing drip pan ! Water from the defrost cycle drains and drips on a pan that sits on the compressor or besides it - the hot air from the compressor will cause water in the pan to evaporate quickly - either through a fan or when the pan is placed directly above compressor. If your model has a fan at the bottom next to compressor, that blows the hot air on it, check to see if it's working when compressor cycle is on.
There is no reason for that drip pan to overflow otherwise, it is quite big enough, and the water from the defrost cycle is usually around 2 ounces and should evaporate quickly.

yep, total defrost is the 1st thing to do. if you want to speed the process, see the following page how to do is good luck