Use your warranty. If you're not happy and the "possibility" of a bad LCD in the making plus you've started the process in case you want your money back. If its a known issue or becoming one will as more users reporting it and becomes known should may a recall or easier to get repairs, refunds, law suits, and all that get done.
I own a new LG W2253V LCD monitor, and I have a very annoying issue with it. When I turn the thing off... the static electricity from cooling crackles and pops for the LONGEST time. Up to 20-30 min and it interferes with my sleep if I turn it off right before bed.
Is this normal? Should I exchange it for a new model? I'm worried a new one of the same model will have the same issues. I've never encountered this with my old LCD.