It does remind me of a test that may be in some Service Menu but to get out of that is only told in the service manuals or if it's busted by replacing the main board.
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Hi, I have this TV: samsung un48h4203
The problem is that suddenly my TV began to show only solid colors (white, red, blue, horizontal stripes, vertical stripes, yellow, cyan, black and repeats). The TV has sound, I can change the channel and raise and lower the volume, but only those colors appear on the screen, I can't see the menu and I can't see the service menu either.
When I turn on the TV the LED flashes 7 times and then goes off, I do not know if that is normal.
I don't know if the TV entered in some kind of special mode, such as the aging mode or the burn mode, or if the television has some internal component damaged.
I hope someone here can help me because I tried many of the solutions I read on the internet (disconnect the TV from the plug, press the up arrow and then the down arrow, the left arrow and then the right arrow, also try to turn off the TV with the panel buttons, but I can't turn it off, just with the remote control).