Facing TV Problems? Ask a TV Technician.
What about the power light, status and lamp lights up front. What are they doing? Lghting or not?
Do you hear a relay click when you attempt to power it on?
Do you hear your fans in the back? How about your color wheel making it's subtle wheee sound and the lamp in back arcing?
V38 with a 915P061010. 2470-opt 2457-adj.
That yellow/black wire pair should have about 340 Volts DC if my schematics are correct. However, that is controlled by a relay. Relay won't engage if the Micro doesn't turn it on. Pressing the power button on the TV set didn't get the power light to turn on, so it must be an issue with the power supply standby 5 or 12 volt circuits and/or the micro.
You have the V38 schematics of your TV set ? Any skill in working with electronics? You need at least some basics like repairing car wiring etc to trace your power supply board and main board.
Did this get hit by a storm?
Sounds like you did get hit, storms /surges take out selectively...not ALL equipment. Any fans running after you press the power button? No 340 Volts usually points to the main board not sending out turn on voltages or the power supply not supplying relay voltages. That's what we need to figure out.