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To Make adjustments, you can check the User Guide for all instructions. Online version at: https://files.bbystatic.com/KWLv7X0biKsrWmHha1NYWA%3D%3D/NS-40D420NA_MX18_49D420NA18_55D420NA_MX18_17-0505_WEB_V2_EN_Final_lr.pdf
Sorry, there was a problem. Please try again later.I haven't had this issue yet. I have occasionally noticed the blockiness on different TV's before. Usually depended on the quality of the show, meaning it was filmed in non-HD or was older. You may also want to try switching HDMI cables and see if that's an issue. Or adjusting the backlight on the tv or trying different viewing settings/modes.
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