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You mentioned a "usb cable" but you cannot connect an external display to a tablet's USB ports. If you are using an HDMI cable, then you will need to select which display is active through the tablet's settings (Android) or control panel (Windows) and also make sure that the TV is set to the appropriate HDMI connection through the input selection.
Try a different HDMI cable, then try the other HDMI inputs on the TV, then try to connect another HDMI device to the TV. If all are still bad main board needs replaced
You'll need to make sure that your laptop & LCD TV have an HDMI port. If they both do, simply connect an HDMI cable from your laptop to your LCD TV and make sure the input on the LCD TV is set to receive A/V from the HDMI port.
There are a couple of things that you can try to see if the image clears up, or is to your liking. You can adjust the resolution of the picture via the menu in the tv. You can also try resetting the tv to the factory settings, via the menu. You can also try auto configuration, which is also a menu item. If you are using a dvd/blu-ray player, use the HDMI cable for optimum picture quality.
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