The Picture Off mode could be enabled if the picture is visible for a while. To check if this is the case, press any button on the remote other than power or volume. If it is, press Menu. Enter the Picture sub-menu and select Picture Off. Disable the feature. This feature is described in the E-manual for the 6350 series TVs here: https://www.samsung.com/us/support/owners/product/2014-led-tv-h6350-series . See http://www.manualsdir.com/manuals/421041/samsung-un32h5500afxza-un32h6350afxza-un50h6400afxza-un48h6400afxza-un65h7150afxza-un60h6350afxza-un65h6400afxza-un48h6350afxza-un40h5500afxza-un60h7150afxza-un46h7150afxza-un50h5500afxza-un75h7150afxza-un60h7100afxza-un55h6350afxza-un40h6350afxza-un55h63.html?page=163 for just the page on the picture off mode. If the picture is dim at times, check if the eco solution mode is enabled (System > Energy Savings).
If the screen is always dark, then the back light is not working. This can be caused by the failure of the LED back lights or the inverter that powers the backlighting. If you see a faint image when you shine a flashlight at the TV, this could the problem. The inverter usually fails before the LEDs. Replacing the inverter requires opening the TV and could have a shock risk. Replacing the backlighting requires separating the LCD panel from the bezel and getting between the layers at the edge of the panel.
I hope this helps.
Cindy Wells
SOURCE: On my Sharp LCD TV a black empty box appears
You will need to find the close caption feature in the menu adjustments and turn it OFF. You should do it for all the individual channels that have it activated.
SOURCE: NEC MultiSync lcd 2010 monitor blank screen
This is the common bad capacitor problem. The caps have died inside, and they can be replaced. If you have basic electronics skills, you can go in, order replacement caps, and unsolder and resolder. If you can't do it yourself, you can take it into a shop.
Here is a link to the Cap plague that explains what happens in detail. But I repair these all the time with that symptom.
http://en.wikipedia.org/wiki/Capacitor_plague
SOURCE: no picture
It sounds like the backlight is out. If you can see a faint image that changes then this is the case. You either need to send in for repair or replace. It can if you are lucky be a connection. You can try removing the video cable and try another source or cable.
SOURCE: SAMSUNG LCD MOD.LE32S71B : AT START THE RED LED PULSES
Replace swollen capacitors on the power board.
SOURCE: samsung lcd 550 overheating? picture tube shuts
sounds like it. if it overheats, the picture by protection, dims down and soon it'll shut off. i would check with the warranty and check it out.
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