See if that resolved it since a bad cable box can sometimes cause a dark screen as well. Then plug one video source (preferably a local DVD/BR or Game console)in and plug the TV in, restart. Unplug your TV, unplug all devices that are plugged into your TV and then hold the power button down for about a minute or so. If you cannot see anything (triple check) then it is possible that this is a bad main board or a bad t-con board as wella s the panel (unlikely but possible) You will have to remove the back from your TV and check the power board with a multimeter Post some good images of all of your boards with your question so we an see what you see. 1) Your TV should support Wireless Display or any sort of Display Dongles. Please follow below steps to mirror your mobile screen to TV. It has been tested and found works on most of android mobiles. This may require replacing the LCD strips inside the panel or a new power board. Screen Mirroring can only play contents but send screen as is such as HDMI, MHL, Miracast and Chromecast. Application to mirror the screen and audio of your Mac to a Roku Streaming Player, Roku Streaming Stick or Roku TV (from Hisense, TCL, Insignia and Sharp). As explained, screen mirroring is network intense.
If so you know that your backlight is not working. Don’t do network intense work while screen mirroring. Then us a flashlight and shine it at an angle against the screen see if you can make out shapes silhouettes etc. Roku Smart TV and Roku Streaming Sticks offer a great solution with their screen mirroring feature.Marlon Manyweather in a darkened room turn the TV on to a channel where you have sound etc. But not all TVs and smart streamers can stream app screens from mobile devices or computers. Even though they came highly recommended and their features are great, they should last longer than 15 1/5 months. this TV was 3 1/5 months out of warranty. Contacted customer support and their solutions did not help. Open the Display tab in the Windows device’s Settings menu and scroll down to Connect to a wireless display. Watching content on the big screen is much easier than on an Android or iPhone device, and even on a laptop. Just had my TCL 55 screen go black have sound tried all the procedures to fix to include reset button. Windows 10 users can screen mirror through these four steps: Turn on the Roku device and open the Settings menu, select System, then Screen mirroring and make sure the Enable screen mirroring option is checked.
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