Michael Eastman, I would at first disassemble the phone and see what it really needs. Something may just have come loose. Check your cables, all connections, and replace your battery. Instructions for your phone are [[Device:LG VX5400#deviceGuides|right here]] some parts are available at http://www.alibaba.com/showroom/parts-for-lg-vx5400.html and http://www.globaldirectparts.com/LG-VX5400-Replacement-Repair-Parts-s/6246.htm as for your logic board, it seems a little more difficult to find and your best bet would probably be ebay.com etc. Hope this helps.