When you corrected the input and output connections what did you actually do? Did you just flip the purple and orange wire connections on the PCB?
When you say it only works the first time you turn it on do you mean with it switched to wah mode on the foot switch you apply power and rocking the treadle sort of does something until you switch to bypass and then back again and .. then what .. no signal or just the treadle has no effect ?
Or do you mean something else entirely, like you power it up and it momentarily seems to do something ... then it doesn't?
All your components seems to be in the right place but of course we can't see if you have all the preset trimmer values in the right positions. There are so many parameters that are adjusted by trimmers in this pedal that the trimmer settings can make a big difference on what the pedal actually does. And then the values of the trimmers varies between a 1K and a 200K. You only need to have got two of those in the wrong positions and it would have a huge effect on how the pedal behaved.
I switched the wires at the pcb. I also desoldered and resoldered some of the other leads that had way too much solder. Now when I first turn on the wah it works fine. Can adjust the trim pots and hear them work. Sounds great. Click the switch and bypass works. Click the switch again and the treadle doesn't change anything. Sounds like it's in the heel down position regardless of where it actually is. Can adjust the trim pots but it sounds the same. No change. Click the switch again bypass works. Click again and it is stuck in the heel down sound.
The only way it "wahs" again is to disconnect and reconnect power. Then it works once and after that only heel down sound as described above.
Double checked the main pot to make sure it wasn't at the end of it's range with the treadle at either end of its range. Tried wiggle all the components to see if something was loose. Not sure what else to try.
If you need me to check anything let me know. I have a meter and know how to use it. Not a complete novice. Just an effects pedal novice. I can wire a Harley from scratch.
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