Samsung smart led tv flashing different colors.

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).

Thank you!!

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Clarification Request
Did ANYONE get into the Service Menu?

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.

More at

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No one in my family touched the service menu, my brother said he was watching tv, he fell asleep for a while and when he woke up the tv had that problem.

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Any warranty?

The failure does look like a test pattern in the service menu. Google your model (I see you forgot to share the trailing 4 or 5 letters) and "Service Menu" then try that IF there is no warranty.

Look for Factory Reset and use that.

I take it you already did the UNPLUG FROM POWER and WAIT 10 minute test.

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No warranty

I bought the TV 3-4 year ago, so I no longer have a guarantee.
The model is un48h4203AFXZX but I can't acces to the service menu, the menu never appears, only those colors.

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Given the story.

I'm going to do something I rarely do and nod to the main board. The one with the CPU and all that.

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Solved ?

Did you got solution?
If yes than how ?
I am having same situation from 3 days !

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(NT) Anyone find a solution. I now have the same problem an my t
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The only causes I know of

The owner was in the service menu. Please folk, stay out of that.
The usual fix is a new main board.

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