Have had this TV for maybe 16 to 18 months and is receiving it's only signal through an Onkyo receiver. It's been a great TV thus far. About a week ago, I noticed it was darker than normal; picture still looked good just somewhat dark. I grabbed the remote to check the settings and see if something got messed with, nothing. I look closer and notice it's ever so slightly flickering once every 1.5 seconds, consistently almost like pulsing. So, I didn't know where to go from there.
Well, last night, I get home from work and the TV is on. I notice its still pulsing and then it flashes off, for about a half second. I'm like, what the..... Ever since, it's never stopped doing the cycle; flicker, flicker, flicker, flash off then on, in 30 second cycles. So, I dig in. swap HDMI cables, change from HDMI to component; no change. I changed sources (once when i went component), then tried air; no change. Menu flashes off as well, whole screen just flashes off. I then tried going from sat. box straight to TV to check tv audio. The TV still flickers exactly the same, but the audio doesn't, so it's a strictly video issue.
I tried vacuuming all the vent areas. I took the left side (looking at it) door off and vacuumed in there. I was getting ready to pull the back off and vacuum that but I don't know enough about it to go digging in to the TV. I've pretty much eliminated all possibilities outside the TV. Screen is still dark, and still flickering/flashing. There haven't been any lights come on, everything is performing normally otherwise.
As far as the front lights, when the TV is off, it has the red standby led lit. TV turns on and there are no leds lit. They have never lit when the TV is running. Just checked out the back with my flashlight and it's surprisingly dust free inside there, but w/o actually getting in there, I guess who knows.
Help, there's a UFC fight Saturday night and we were going to have a fight party.