Will not turn on

I have mod #p60755at give to me, i pluged it in it made whisling noise! i tracked it down, it was the HV splitter modual located in front access pannel,took it out, found 2 pin holes and scorh marks. I then took a hot glue gun,patched & replaced. It worked fine 3 months then quit! I changed that part (HV is high voltage,be sure it unpluged !) I replced the part and it still does nothing ! Power light does nothing,Ibeleive the problem is simple, I havent figured it out yet! Any suggestions?

This sound is the power supply trying to fire,leaky caps notholding proper b+ voltage.you can check the error codes once the set does fire to view the fault code and narrow it what section is possibly at fault.rca sets take three tries then you out feature. thats why when it does fire check the codes,get a service manual also to help you out.