Even in my part of the world a refurb has 3 months warranty. Your set is well inside warranty do no reason to do more than get it into service under warranty.
2 months ago I bought an NEC P42XC10 42 inch plasma monitor. The model is a few years dated, but it was brand new, never been used. I am using it for video games, movies, tv, etc.
2 weeks ago I was watching a movie on it with a Philips DVP-3680 dvd player via HDMI input. I'd been using it for about a week at this point. I went to turn the tv and dvd player on and I heard a noticeable "click" behind the tv. Even though the dvd player was on, the tv said "NO SIGNAL". I removed the HDMI cable, flipped it around, changed it to a new cable (process of elimination)... nothing worked. I tried using the composite (RCA) cable instead, and it did. I tried a different DVD player via HDMI, and no dice. So it seems that the HDMI input on my tv is broken. A service tech looked at it and confirmed that it's damaged, and the whole main board needs to be replaced.
I began looking for a main board to replace it, but in the mean time I just watched movies via composite. Well, just a couple of days ago, I'm watching a movie and there was a VERY loud "click" (possibly a spark, but i didn't see one" and the whole screen went DEAD. Nothing whatsoever except the audio still played. The power to the tv was still on as well, just no picture. My ears perked up and I noticed that at that moment, the AC unit outside was just turning on as well, so maybe they're connected? I immediately shut the tv off. Waited. Turned it back on. Same thing.
At the time that both of these things happened, all that was connected was the DVD player and the TV. No cable box yet. So the DVD player had power, the tv as well, and they were connected via HDMI / RCA connection. It's also strange that the DVD player didn't appear to be damaged (nothing else in the apt was in fact), JUST the TV. If it were a power surge, I would think it would affect them both, but again, I'm not sure.
It seems to me that whenever THIS dvd player is connected, any video port it's connected to is destined to be destroyed. Can a faulty DVD player cause damage via video (HDMI / RCA) signals? Can it be the sole culprit, or should I have an electrician come investigate the wiring in my apartment (AC unit) as well? I am going to get a new tv soon, but I want to resolve what keeps happening first before putting it at risk as well. I'd appreciate any help you can offer! I'm really unsure what to do.