Hoping someone in here my of some insight for me!
I was perusing local Craigslist today when I saw an ad for someone getting rid of a DS-1 for $25. I figured why not, I'd never owned one.
I drove over and when I got there the gentleman handed me a brand new looking DS-1. Cool. He apologized that he didn't check to see if it worked before he listed it.
He said the LED wasn't turning on and to just take it. If it started working with a different power supply I could Venmo him.
I got it home, plugged cables into the input and outputs, and ran power from my Walrus PS.
LED comes on. Cool! Except no bypass signal. It only work when the pedal is engaged. Huh...OK.
I flip it over, its an earlier made in Taiwan model. I decided to open it up and poke around a little.
To my surprise it's a through-hole model. What struck me as odd as the bottom backing plate didn't have anything between the backplate and the board, just a raw metal against the board. I can't recall if my other Boss pedals are like that but it seemed off.
I futzed around with it for a while more, trying a new 9v battery in place of a power supply (works when engaged but not when bypassed). When putting the back plate back on there was a spark. Clean signal! But only for a moment. By the time I strummed a few chords and flipped it over it was back to working but only when bypassed.
Nothing looks obviously fried to the layperson but ¯\_(ツ)_/¯ .
Any insight? I'd love to get this thing working but techs are in short supply here in SF and have a bench fee of $75.
Doing my best to attach some photos that might be of help. The pedal looks to be in great shape otherwise.