hi all! got a vistron 37" tv with power led on but no functions at all, no sound pic or anything just a blue led, have 5 volts only coming from psu, the 5v 12v and 24v not being switched on, any ideas anybody? will include a pic of psu and main av board. ps main board type is Vistron 37LCDTV - Main AV - HH-LCD.PCB.YD-106