Check the HDMI management ic, usually from Silicon Image. Replace it if in doubt..
I have this problem too, in an older samsung, Its a intermittent problem, started ever since i tripped up on the hdmi cable and it caused a bit of havoc to the port, It only works sometimes if you wiggle the port with cable plugged in like as if there was a cracked solder joint.
I tried to run my soldering iron over the pads but it made no difference, must be the ports? they are smd type that are perpendicular to the pcb.
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