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Hello, I'm TV Tech1 and I'll be working with you to identify and help you resolve your problem.
To isolate this problem further, Unplug the TV's power cord, and the HDMI cable, wait 20 minutes, then take a totally different device and plug it in and power up the TV set and device, do not connect the HDMI for at least one minute, then plug it in.
Now see if that new device functions or not. If it does, then try the unit that wasn't working, but make sure you power it on after being unplugged too. Same procedure on that unit, but you don't have to reset the TV, it has already been reset.
Tell me the outcome of those tests, because sometimes the TV or unit needs that reset procedure to get it working correctly.
Yeah, it's odd but necessary because an HDMI TV connection isn't reading any signal whatsoever. No 5 volts, no clock or data signals, it's 100% dead on the TV set with that Onscreen response.
The odder thing....you're my 3rd "mover" this week. Is this a national event? College doesn't start this late.
Anyways, before we can search for the correct board to replace, we do need you to verify what the model number is. ( PN51D550?)
If wall mounted, you should find a sticker right along the right edge of the cabinet, halfway up. I usually have to lean against the wall right beside it to write it down.
Otherwise stands give you better access to the larger sticker with the model number, and here's an example --
Yeah, I know, it's odd that all that occurred is you unplugged the power cords from your equipment, moved it about 2 feet and suddenly the HDMI doesn't work at all. But I've seen all sorts of weird things occur, from static electricity buildup during moving, to just plugging in the power cord at the wrong time to an erratic connection during the plug in.
Those are the only logical conclusions I can imagine since the 20 minute power down, followed by the one minute power on and finally reconnecting the HDMI didn't clear the HDMI's handshaking and create a new one.
This is reasonably priced --
In comparison to this company it's 1/4 the cost --
Removing isn't hard, There's like 22 screws on the back cover to remove it, 4 on the main board, and maybe 3 to 5 latching connectors that you waddle off the pins.
Probably easier than assembling furniture from a box.
Ok that should help you with your HDMI problem. If you have spare cables that match the other type of input jacks on your PVR, You can add them temporarily so you can watch TV on another input, until you get the main board.