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Probably a bad fuse on the main board. Fuse is not replaceable so either you have do a workaround (search LG refrigerator fuse repair for several fix videos and how-to's) or you have to replace the whole control board (part EBR41531302 I believe, but double check with your the part vendor before ordering).
Check the fuse by pulling the refrigerator out, unplugging, taking off back control board panel, and checking the fuse for continuity.
Did you have a power surge recently? That fuse can't blow itself. If a power surge got you then I would say to pull the board and put another fuse in. Of coarse unplug the refrigerator first. This may involve some soldering to remove the caps over the end of the fuse. If you did not experience a power surge then you should probably replace the board. If a component on the board has faulted, then replacing the fuse would be pointless. Because it would just blow it again. Hope this helps.
ctmarrero was correct! There are two fuses on the mother board, and the larger one was blown. I took off the mother board (easy) and soldered off the old fuse and replaced it with a new fuse holder that will allow me to replace it next time without soldering. The fuse is a 250V 15A. This cost me less than $5. The new "PCB Assembly Main" EAP3533829" board cost $181.82 on easyappliance parts.com. Bad design by LG, should have had a fuse holder so it can be replaced easily.....
most fuses on the board are only replaced with the board . I would use a after market fuse of the same rating . and if it blower it again find out why ... l g may not supply the fuse but any electronic supply should have it . mm
the fuse is soderedto the board and is not to be replaced as a replacement part . but that doesn't mean that you cannot replace it . it may blow again and if so find out why . the board may be very costly and the fuse is not . so it's worth a try .. mm
replacing the mother board is the option that a repair person uses if they are authorized on the back of the unit there is a square plate remove it and you will see the mother board. on the bottom right of the mother board is the culprit fuse. its soldered in. you will have to go to an electronic store and get another fuse and either replace it or have them replace it for you. i went to radio shack and picked up the fuse holder, soldered it in and in the future will only need to replace fuse.