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LE37B530 image problem


I am here because I need help or aadvice.
I buyed a LE37B530 from one of our online store in Romania. Everything goes fine, the delivery was fast, the tv great. After one week, I've noticed thet he make a strange noise from the power supply in the back, hearable only at night, where ambiental noise are low: no cars, no birds, etc. I took it to the stor, they test it for one week and says thet nothing is abnormal. Anyway, because the nois affet the, let's say, user expirience, i agrre do pay more money to change it with the same model. I dodn't want to send it to service because the answer, I am pretty sure, were the same: TV is OK!
Now, the other one, which is produced in Hungary, as the old one, in 2009, have a poor picture quality, but no noise on the back. I've teste them both at the store, in the same day when the exchange was made. The black is not so black and the colours are somkind, fainted. I was happy thet the noise is gone. I thught that I can set it up at home, but i wasn't right . Any advice how to proceed? Are there any settings to be made?
The firmware is the latest avaiblable on the website, the model is LE37B530PTW.

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