LG 47LN5200 and similar models common fail + easy fix
just thought i'd share my experience as i came into a few LG sets that shared this same panel and they all failed the same way. the PSU could be tricked on, and was giving enough volts that should have powered the LED strips, but i wasnt even getting so much as a flash.
after taking apart the panel and finding a bad LED (or two) i reassembled the panel only to see it doing exactly the same thing. according to my LED tester, all the strips were fine now, and according to my voltmeter, the PSU was outputting good voltage but still nothing.
i took apart the panel again to see if volts were actually going to the strips and discovered they werent.
so what it turned out to be was the LED connector on the PSU even though it looks fine and like its making enough contact, it just isnt. i dont know how this can go bad over time (maybe oxidized?) but it's a loose fit to begin with.
i took some super thin copper strands and fed them through each pin hole of the connector and around the back and just kinda twist tied them in place (to add more copper material inside the pin holes) and jammed that sucker back in there and now it works flawlessly.
i literally did this same fix to 3 LG's in a row, so i guess this is a common failure where the connector stops making good contact (maybe leading to destroying some LED's?)
anyway just thought id leave this here in case anyone comes looking for info about LG 47LN sets...