Just bought a new lg tv. the problem I am having is that during viewing a message comes on that says critical error with memory card unable to read memory card. But there is no memory card inserted in the tv
Check the settings on the Setup Menu to see if you can diable the memeory card checking function.
It also sounds like you need to have a memory card inserted for user definable settings to be saved. Why not try a memory card in it?
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Tv power supply board is developing a problems.That the board where the power a/c cord plug into it.That why tv is have voltages glitches intermittently power shutdown unknown times.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
This model has just a 50Hz refresh rate and so this is a known problem. Try and view it from the recommended distance of 3 times the TV diagonal width ; the effect of this problem will be vastly lessened.
I , would try using another ( alternative connection) from your humax , say the scart cable just to see if it , the humax is ok. then if tv has more than 1 hdmi skt try it too, if still not working retry upgrade firmware route
Ur power supply board.Transformers have have high voltage gap.This problems must take the tv aparts put some glue arond the transformers,sometime solved this problems,or must replaced all the trnsformers make the humming noise.Brand new tv take it back,where u bought it get a replacement or call the Manufacture help to fix the problems or replaced the part that cause the problem.