204451972 Vizio 42

Question

204451972 Vizio 42" Widescreen Plasma has sound but no picture. Repair Center say's it needs a new power supply as they think it took a power surge. They want $475 to fix. That's about 2/3 of what I paid for it. Far more than I want to spend fixing it. Where can I get a replacement power supply and instructions for it's replacement.