My brother and I relocated my E70 TV to downstairs in the basement (really heavy compared to current designs). Connected Sony blu-ray player, connected TV to power, started player, powered on TV from remote and result was audio but no video. Have 5 year warranty from Square Trade with one year left. I consider myself extremely lucky for having extended warranty. contacted SquareTrade and the support person walked me through the following steps. It didn't fix anything, so they are sending out parts and a technician. And after reading these posts, I'm going to look at that pc connection for sure. But I'm going to list what he instructed me to do, though it was useless:
1. unplug tv from power source. (I just unplugged the connector from the back of the TV). Also unplug any hdmi cables to peripheral devices.
2. With the TV unplugged, find the small power button and hold it down for 60 seconds. (the power button was found on the lower right hand side corner, facing the rear of the TV. It's about 1/2" square. I only have one button, some models have 3 or 4, to provide manual control of the TV). I believe this step resets the power logic on the main board. Same technique is used on laptops.
3. Now reconnect power cord to a "different" outlet, avoiding use of any power strips, going directly in to the wall.
4. Using the remote, turn on the TV. Didn't see anything. Turn out lights in room. I can see gray or bluish backlight from led's. looks like a faint cloud. no image.
5. press the menu button. nothing comes up on the display.
6. power on the blu-ray player, DVD starts playing. No video. Same dark screen.
7. "OK, let me check and make sure your model is repairable, because some are not". "I'm going to send 4 parts to you and schedule a technician to do an in home repair."
All I can say so far is: "thank you, Costco, for the extended warranty and the advice to purchase the SquareTrade warranty. Its probably the only time I have ever bought one. btw, I did keep my original receipt. I would say I am very lucky. We shall see how things go. It will take a week.