Electro Harmonix POG V1 no effect signal

[beedoola]

I hadn't used this pedal in awhile and I found my stock EHX power supply was putting out 24v instead of the 18v.

I'm using my Ciocks power supply putting out 18v DC and the Bypass works as does the LED. When the effect is engaged I'm getting no signal through.

EHX used to fix this for a reasonable fee but are no longer doing that so I'm hoping I can bring this awesome pedal back to life. Here are some gut shots. I did some voltage testing around U6 and got some voltage at the IC but hoping someone can offer some other troubleshooting suggestions for what to check voltage wise. I'm wondering if the failed PS blew something which is resulting in the issue.

[g1]

(edit: pics are showing now)

[The Dude]

Unloaded power supplies will often read higher than expected voltage until you load them. That said, can you post a schematic?

[beedoola]

I think I fixed the image issue. Here is the schematic:

https://www.synthxl.com/wp-content/u...Schematics.pdf

[The Dude]

Start with your power supplies (page 2 of schematic) and make sure they are there and clean. I see 12V and a couple of 3.3V supplies. and another 3.3V supply if you have more than one RAM chip installed.

[beedoola]

All the voltages check on. Used the test points as well as testing the ICs in question. Looks like U5 isn’t part of the production build as I don’t see it on the board.

[The Dude]

I'd try removing the microcontroller from it's socket, cleaning the socket pins and reinstalling. I've seen those socket pins cause problems in the past. Just be careful not to damage socket or pins. It's not difficult to break something. Also note chip orientation when reinstalling.

[beedoola]

I'd try removing the microcontroller from it's socket, cleaning the socket pins and reinstalling. I've seen those socket pins cause problems in the past. Just be careful not to damage socket or pins. It's not difficult to break something. Also note chip orientation when reinstalling.

The Dude abides! That worked. I've owned many a Line DL-4 and often a chip reset has fixed issues and I didn't think to pull the chip. Pulled it - very carefully of course - and clean both the socket pis and IC pins with some Deoxit. It is working as it should.

Prior to that I was poking around and started to get something where the pedal would register a note but it was all garbled. And all the level controls, input and filter worked.

Much appreciated everyone.