Re: LG 60PV450 Power Issue
Assuming the buttons and Remote receiver are working, replacing the main board (as you correctly stated the 'one with the HDMI inputs' will 'fix' the tv. It will turn on and should display and image...
However the blue bar will not go away.
The only thing you can try is to reseat and clean the corresponding tab bond that lines up with the blue bar.....
To do this you'll need to remove the long heat sink that runs down the bottom of the tv here:

Once removed you'll notice lots of tabs that connect to the panel, clean and reseat the one that's at fault.
Please note: DO NOT run the tv with the heat sink removed or you will blow the other ICs. These ribbons run HOT and need the heatsink in place.
This will probably only have a 2% chance of working... But nothing to lose in tying.
Assuming the buttons and Remote receiver are working, replacing the main board (as you correctly stated the 'one with the HDMI inputs' will 'fix' the tv. It will turn on and should display and image...
However the blue bar will not go away.
The only thing you can try is to reseat and clean the corresponding tab bond that lines up with the blue bar.....
To do this you'll need to remove the long heat sink that runs down the bottom of the tv here:

Once removed you'll notice lots of tabs that connect to the panel, clean and reseat the one that's at fault.
Please note: DO NOT run the tv with the heat sink removed or you will blow the other ICs. These ribbons run HOT and need the heatsink in place.
This will probably only have a 2% chance of working... But nothing to lose in tying.
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