Unless you get a service manual you will be shooting in the dark. Also, when I wanted to dispose of a dead big screen it would cost me 45 bucks at the dump/recycle place. So to avoid that I could give it away (some may sell such!) or wait for a free recycle weekend which is not free either as they ask for a donation.
There it is. Try those tv repair forums such as AVSFORUMS but put on your flame guards.
Ok I just picked up a 42 lcd panasonic and the person i got it from said it was the power supply that was bad I volt test it and it seemed to have low volt on some spots and none on others. So i ordered a new power supply and its still not getting power to the tv and it wont turn on or have the red light come on at all the model number is tc-l42u25. If u guys could tell me y its still not getting power would be great.