Using the LG TV remote, pressing the menu button doesn't display anything. I don't hear anything from the set, but I don't have a input hooked up currently aside from an antenna. Normally when the set turns on it displays the LG logo and the time, it is not doing this either.
Before I swapped the main board the TV was blinking red twice, going blue then shutting down.
The boards were the same part number, but each had a different sub part number. From what I can tell, the board will take the same firmware, but its possible to configure the screen size from a service menu.
I found a blog where the reverse swap worked. A 47LW5300 board went into a 55LW5300 TV.
Both boards are part number EAX64290501 (0) This number is XXXXX screened onto both boards
The sub part number is XXXXX on a paper label
the 47LW5300 has another part number of EBT61701614
The 55LW500 has another part number of EBT61701310
Ebay. Electronic recycler. The board was supposed to have come from a working unit with a damaged LCD panel.