I had the exact same issue. I bought a new tv for my family room and moved the Sceptre to a seldom used location. When I did turn the Sceptre on after a couple of months, it was good as new. The dark areas disappeared completely
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The tcon Board or the LCD panel is faulty. You have to replace the Tcon Board to confirm whether it was Tcon or the LCD panel.
If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
The problem is more or less with the LCD screen itself. The manufatcurer covers dead or burnt pixels.I would suggest contact Vizio Support on the following number
Technical Support Toll-Free: 877.698.4946
If it appears using any input - TV, Video, HDMI, etc. it is an internal fault and needs serious repair. If it appears on only 1 input it might be internal or external to the TV. Try feeding the same input with a different device.
usually you can correct this issue with only a few system checks, dark streaks can be caused by damaged pixels on the screen, in which case you need to replace the TV.
Inspect where the dark streaks are on the television. If the streaks occur at the same place on the top and bottom of the screen, they are due to the formatting of a movie or television show you are watching. This is normal. Also, if the streaks appear on the left and right of the screen, they are due to the show being filmed in full-screen instead of wide-screen. This also is normal.
Change the input setting so you are viewing the contents of a different device. If the dark streaks are gone, you know they are due to the device connected to it. However, if the dark streaks remains no matter what input the TV is connected to, the problem lies with the television.
Inspect the cable connection. Oftentimes when connecting a computer to an LCD TV, you can have strange dark streaks across the screen. Use a DVI-to-HDMI cable connection when plugging in your computer, then press the "Menu" button on your TV remote, select "Picture" and chose "Square Pixel." See whether the image adjusts and the dark streak goes away.
Contact the manufacturer of your LCD television if the dark streak remains. This streak can be caused by a defect in the television; if the TV is still under warranty, you can have it replaced.
Dead and Stuck Pixels
Pixel defects for an LCD monitor are defined as one of two types: dead or stuck. Technically, both types of pixel defects are stuck pixels but it really deals with the electrical currents and the state of each pixel or sub-pixel.
A dead pixel is defined as a pixel or set of sub-pixels that has failed and is permanently in the off position. This condition means that the pixel will not let any light through. This can be observed as a dark or black spot on a brightly colored or white background.
A stuck pixel is defined as a pixel or sub-pixel that has failed and is permanently in the on position. This can be either with a single or multiple sub-pixels for a given pixel and is best observed on a dark or black background. A white pixel means all three sub-pixels have failed while a green, red or blue pixel means one of the sub-pixels has failed.
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The HDMI cable was causing "Display connected non-HDCP compliant" error message to appear. When I reconnected my DVD to TV using regular cable with 3 color connectors(i don't know what is the proper name for that cable) that error message no longer appears on my screen and I was able to watch my movie normally.