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Put this Doom Prophet together, all the circuits work, but the LED on the distortion circuit doesn’t work. I’m getting tone from my DMM from the LED to the CLR and from the LED to R34. I also attached another LED inside to verify that it wasn’t the LED. That one also dos not turn on. Fairly new at troubleshooting. Any hints would be appreciated.
What value of current limiting resistor are you using on the 3PDT?
It’s too hard to see but looks different.
Depending on the value of the CLR that was used you may have instantly blown the previous LEDs.
I would try another new LED. You can pre-test with a 3v coin battery.
If that doesn’t help I would test all of the connections between the 3PDT and main board with regard to the LED using your DMM in continuity mode. If you verify by pre-test the LED is working and you solder it back in and it still doesn’t work then i would look at these three things in order. Soldering an LED with minimal contact can also introduce a cold joint.
- Blown LED
- LED lead not actually connected
- Cold joints on 3PDT daughterboard
- Broken connection between main board and switch board (ribbon connections)
One additional test would be to temporarily connect the LED cathode directly to any ground via jumper (leave the Anode connected). If the LED lights, then the issue is definitely somewhere in the switching path between the 3PDT and the main board.
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