This usually indicates a backlight failure. The TV is working, but the backlight that illuminates the screen has failed. This requires professional repair. Try shining a flashlight on the screen - if you can faintly see an image, it confirms backlight failure.
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The picture test displays a test pattern to verify if your TV screen is working properly. Access it by pressing Menu > Support > Self Diagnosis > Picture Test. If the test pattern shows correctly, the issue is with your input source, not the TV.
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Check the back or side of your TV - HDMI ports are labeled (HDMI 1, HDMI 2, etc.). Match this with the input source you select on your TV. Many modern TVs also show a preview of what's connected to each port.