A:AnswerLet's get you to the following article which will walk through how to adjust this - http://www.lg.com/us/support/product-help/CT10000018-1432651636835-dark-or-dim-picture ^CP
A:AnswerThe 65SM8600PUA has a native refresh rate of 120Hz. That means that the image on the TV is refreshed 120 times per second. The TV supports 4K @ 60Hz. 4K is a feature of your A/V receiver that allows a video source to pass unaffected through his receiver to the TV without any processing. In order to transfer a 4K signal at 60 fps, receivers must be HDMI 2.0 compliant and HDCP 2.2 compliant. If you have additional concerns or questions, you can contact our Customer Support by any of the below options:
Phone: 1-800-243-0000
Live Chat: https://www.lg.com/us/support/chatbot
Email: https://www.lg.com/us/support/email-appointment
Facebook Messenger: https://www.facebook.com/LGUSA/
Twitter: @LGUSSupport
The LG Community Forum is also a great resource for getting help from other LG customers: https://lgcommunity.us.com/
A:AnswerThe Specifications for the LG Nano 8 Series 4K 65 inch Class Smart UHD NanoCell TV w/ AI ThinQ® (64.5'' Diag), Model # 65SM8600PUA on the Best Buy site list the Refresh Rate as 120Hz...^IFV
