you can try this
Disconnect all HDMI sources from inputs.
remove the power plug from TV/LCD
Plug in the TV/LCD back in.
Connect HDMI cable one device at a time.
Turn on your device (ex. PS3).
continue connecting all hdmi ports one after one
My HDMI3 port on my Samsung smart TV has suddenly stopped working. I bought a new cable and it worked for a moment then stopped again. HDMI 1 and 2 are both working. I have read some of the solutions and tried them but no luck. I use the HDMI cable to link my iPad to the TV. Any help welcome.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic