No power on Sharp XL-MP60 Micro-Component Stereo System

My Sharp XL-MP60 Micro-Component Stereo System died a few days ago. It's plugged in, but is completely dead - no lights, no noises, nothing at all.

I checked to make sure the power cord is secure at both ends, and that the outlet has power. I tried the reset procedure on page 30 of the manual. I disassembled the unit and checked the three fuses, and made sure the transformer was putting out voltage on the two output connectors.

The unit has four printed circuit boards: radio, control panel, CD transport unit, and main power & audio amplifier. My guess is that either the control panel board or the main power board is dead, but the local Sharp-authorized service center wants $50 just to look at it.

I'm thinking about trying to buy the boards from Sharp, and maybe buy a Sams Photofacts guide to help troubleshoot it. But it would be easier to just replace the whole thing.