I followed steps below and it worked for me on my Samsung 55F7000 TV:
1- Power off all HDMI devices connected to TV
2- Disconnect all HDMI cables from TV
3- Power off and unplug the TV's power cord from the wall outlet
4- Press and hold the TV power button for 30 seconds
5- Reconnect HDMI cables back to HDMI ports on TV
6- Re-plug the TV's power cord back into the wall outlet and check the TV.
If the above troubleshooting steps didn't help send a private message to any moderator to set up service if your device is within the 1-year warranty.
If you're out of warranty, use the following link to locate a service center in your area:
I'm sorry to hear that, which devices have you tried connecting to the TV? Also, have you tried using a different HDMI cable?
I see that you have done some troubleshooting, can I also have your current software version?
Everything is up to date with your TV the next step would be service can you please send me a private message with your full model and serial number so that I may look into this?
I'm having a lot of trouble with my TV Model UN65MU6500, suddlently all 3 HDMI ports stoped working... First it looked good then, with a red sign over and then trying to connect there was a legend saying NO SIGNAL.
I have tried the reccomendation of unplugged all, reset the tv for about 30 seconds, plug all, but havent successs...
Please if anyone knows how to fix this, i will appreciate!