hyundai hlt 3773 LCD stuck in standby

[mase]

when i plug in the only voltage present is 3.6-4.2v standby ..when i have managed to get it to switch on all the voltages are ok.when it wont switch on i get 3.6-4.2v on standby,if i turn it on i get a quick flash of approx 2.6 v on the 'power on' terminal and then it pulses that same 2.6v every second...with the power on but the power board disconnected from the main boardi get 4.99 v on standby,is it normal for the voltage drop from 4.99 to 3.6-4.2(set in off state),thanks[/img]