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TV won't recognize PC through HDMI port anymore

I have had a PC attached to my Mitsubishi WD-73333 through a Sony receiver to the HDMI port 1 and it has been working well for years. Recently, the TV does not recognize the HDMI port when restarted. we have found that shutting the TV off and then switching off the surge protector that all the components (TV included) are attached to then restarting the TV and going through the TV menu to the input setup will make it recognize the HDMI port again. Switching the HDMI cable to the other HDMI ports on the TV does not help - the TV does not recognize the port switched to but recognizes the previous port (the one that the HDMI cable has just been removed from even though it is empty). I have tried attaching the HDMI cord directly from the PC to the TV but the same thing happens. Can you help me?

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Thanks for all the background, super detailed! I had a similar problem on a new Samsung that was really flaky with my HDMI from a raspberry pi. Would have to do all kinds of unplugging, cycling power etc like you're doing to get it to work. Once on it would work until I turned the tv off (actually doesn't turn off, but goes to sleep) and back on. Finally figured out that the resolution I was outputting wasn't supported, BUT sometimes it would work. Once I changed the resolution to a supported resolution it worked all the time.

Posted on Mar 26, 2014

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  • Angelo Chirban
    Angelo Chirban Mar 28, 2014

    The resolution was never changed over the several years that the system worked. I raised it and lowered itper your instructions without success. The problem continues. Thanks anyway.

  • Larry Symms Mar 28, 2014

    what about refresh rate? If that hasn't changed not sure what to tell you. Something's clearly different than it was (hardware or software), I'm guessing you've tried various cords. Have you tried plugging the PC into other HDMI displays?

  • Angelo Chirban
    Angelo Chirban Mar 28, 2014

    Thanks for your input. Please remember that the TV HDMI (is recognized) works now. By turning off the TV then turning off the surge protector that has everything attached to it for a minute or so. After turning everything back on and going through the input setup on the TV, it recognizes the HDMI port and all is good. I can't understand why.

  • Larry Symms Mar 28, 2014

    how long is the cable? If it's more than 10 ft it may just be a problem in the cable with signal distortion which the TV has trouble interpreting. Once connected it has enough signal to interpret properly but you may be getting some noise coming through.

  • Larry Symms Mar 28, 2014

    Also, some cables can degrade slightly reducing insulative properties. I would try a short, known working, hdmi cable for a while (although WAF - Wife Appreciation Factor may be an issue). Alway try to eliminate the least expensive component as a culprit.

  • Larry Symms Mar 28, 2014

    might also be able to boost the signal of your PC's hdmi port



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