LG 42LD490 stuck in standby

[sparkman001]

Have any of you guys come across this one before? Its a 42LD490 on switch on it sounds like its about to spring into life, but fails and the only results are a slow flashing red standby led. The power supply has had new caps in the secondary, and all voltages are ok. Results are the same with the tcon board disconnected. Im beginning to fear a motherboard issue. Any ideas chaps? Or anyone got a spare board from a scrapper?
Bill