Any help would be appreciated. Our Vizio VW26L that we use in our camper won't power up. When plugged in, it makes a humming noise from the speakers, and the amber power light doesn't turn on. Pushing the power buttons on the remote and on the TV do not turn the set on. I have taken the back off, but don't see any fuses to check, as some of the other posters have suggested. Don't see any obvious signs of capacitors failing. Thanks.