Got this JVC model XV-S200 DVD player the other day, quite a nice-looking unit. Anyway, it would power but wouldn't play or open the tray. I replaced several bad caps in the power supply, this got the unit to power up and play, but with no audio whatsoever. Strange thing is, it plays audio CD's just fine - it just won't play back the audio on a DVD. I've never encountered a problem quite like this, though I'm still quite new to DVD servicing. Any ideas?