If everything works ok except the PS3 on the TV then suspect the PS#. Is there any other device you can plug into the HDMI port if thats what you are using? If they work then the issue is the PS3 and not the TV. Please take a few moments to rate my answer. Thanks..
Is it the HDMI port you are using? Then the possibility of a software upgrade to your new board might be needed. Go to the LG website and look through support to see if updates are down-loadable. If so it will show you the newest version and tell you how to check your current running version in your TV. See the problem is just because its a new replacement board doesn't mean the board was sitting around for a awhile and has the original software loaded on it. The other thing to do is call LG themselves and they should be able to let you know..
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I took my PS3 to my neighbor and it works fine. Also, any DVD player I hook up to my TV works just fine.
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