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In looking up this TV, it doesn't show a USB port anywhere.
The manual doesn't mention it. NewEgg doesn't mention it. C/net doesn't mention it.
There's a pc audio port, VGA, 75ohm antenna, 3 HDMI and a Coaxial.
Did you mean any of these?
If there is a USB, it's probably only used for software updates.
HDMI software might not have been installed. Contact the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
DON'T wiggle it anymore because the connection solder points are loose and you will eventually crack the connector or the PCB it's soldered to. If it is not to much hassle you can remove the TV/Case cover and hit the points with a soldering iron.
Did you ever find a solution to this problem? I have the same model TV and I cannot get anything to display from a DVI video source. Anything "pure" HDMI like a DVD player, XBOX 360, or media streamer, work fine. I now have a PC connected to the TV. The PC has an HDMI port and works fine on 2 LCD TVs I have at home but not this one. I'm starting to think it's a wierd HDCP thing.
You have to use the scart connector for on screen menu settings. Go to the video option and enable HDMI and/or match resolution output to your set.
You did not mention the model of the TV so here is another scenario,
Just because the TV is 1 year old doesn't mean that it is a 1080p capable, you could have set the HDMI resolution settings to 1080p and you will not get any picture if your set cannot process the information.
you didn't mention what software version your ps3 is. in this digital age it's important to keep software levels up to date, with some exceptions. i'm including the web address for sony so you can update the ps3, but i don't think it's the problem. once you're are on their site you click on the ps3 picture & that link will take you to the software update pg. there you can review previous software updates. i quickly reviewed 1 of those & didn't see anything that addresses your problem.
have you verified that the HDMI inputs are are enabled correctly? thereare 4 inputs. refer to pgs 25 & 26 of the owner's manual.
I would put the heat on your LG retailer. clearly the new main board is suspect. you had the functions prior to the swap. the board is probably defective, but with a different problem than what you had previously. i visited LG's site. they currently have nothing in their knowledge base that mentions the your problem, nor is there a software update.
if you need additional help. write back. good luck.