Ok, so the TV turns on....stays on for a while. Eventually it just turns off.
But you can SEE the HDMI 1 appear with no problems whatsoever, correct?
How about the TV's MENU or Volume bar? Can you make it show up using the remote or the Keys on the TV?
That would at least tell us --
The Screen can display on command, and the Micro does respond to the buttons.
If it can, tell me. The good news is if you CAN SEE HDMI showing on the TV screen, then it's going to be LESS costly, and you can repair it yourself.
But let's run a test BEFORE we delve into your TV set.
First, you may simply have scrambled computers....either in your TV or possibly the Cable or Satellite box you are using.
That'll give you a TV showing HDMI on it, but with no picture.
UNPLUG the power cord on your TV set, Cable/Sat box, and any OTHER boxes (DVD or games) for a FULL 5 MINUTES to reset the computers.
Also UNPLUG any HDMI cables, because they can get scrambled too.
Wait that 5 minutes, then plug in the power cords, and turn EVERYTHING back on.
WAIT ONE MORE MINUTE, then reconnect the HDMI cables.
That process resets all computers, and all HDMI connections.
See if you get a picture and sound now.
If not....activate the TV menu or volume bar and see if those show up on the TV screen.
Because of storms, we see a lot of locked up TVs and cable boxes making the TV look like it's bad, when it's not.