Digitech Digiverb won't power up

[01redcobra]

About a week ago, I replaced a switch (effect on-off) for a friend in his Digiverb. Worked fine for a few days, then he said it won't power up. I don't see anything that looks bad and I tested the diode (d7) and found that ok. Before, you would see the LED light up when you inserted a cable into the in jack and now nothing happens. The switched jack is working too. Any ideas? I have been unable to locate a schematic for this pedal.