With no signal input, a screen will almost always have artifacts of the last thing shown. This is not burn in. If you apply a signal and can see a logo THEN you could have image retention which shows itself above the minimal state of a panel with active signal. I wouldn't doubt the majority of all the forum IR nonsense stems from this. A problem which does not exist in viewing, but the customer "knows" it's there. This is one of the reasons no mfg warranties BI. This is like the police going to a little old lady's house because she wants to file obscenity charges against a neighbor. When they get there and inquire, she says "Here, you have to climb this tree and use my binoculars".
In consumer electronics you have the ideal and you have the real world. In the ideal somebody reads his favorite forum cowboy, buy a beanie with a propeller just like his, gets his set calibrated and watches test patterns with his beanie. You have no issues but your heart thumps when a new firmware comes out because it is gooder. If you think there is a problem nobody else can see, you must have a "bad one" of that series of panels.
In the real world, you plug in your tv, adjust it, and watch it and determine if your overall experience after watching many shows is good or bad. You can have a good laugh after you watch "Survivor" with fabulous color and detail and "Elementary" with green tinted shadows when you friend with beanie who spent 1/3 of his tv's cost to have it calibrated, tells you his green tinted "Elementary" was "better".
