LG 42LN575V-ZE std by flashes 3 times

[EVILMRB]

Hi any help would be appreciated I have a LG 42LN575V-ZE and the problem is when i press the remote to come on the led flashes 3 times then blank no picture or sound so I have checked all the voltages on the power board and have the std by 3.5v two  12v and a 24v feed. I have read that people have been baking the main board due to the xd engine ic not having very good contact with the board but I don`t want to go that far yet until I have looked at other possibilities. Also I am getting the the right voltages from the led side of the power board as well..

Thanks Lee