DL4 Low signal at output

[GiovannyS10]

Hello guys!
I have been working in a Line 6 DL4 for the last two days. Another guy took it before and it's hard to know what was in his mind but he messed the board so much. Anyway i have been fixing all steps and finally i have the signal coming to the last one opamp. It's a TLC272C precision opamp. The signal come to it's inverting input but there's a very low sound at it's out. I have another DL4 died board but another version. Anyway i took it's 272 and soldered in my board but continue no sound. I traced the circuit and it looks like below:

This circuit is duplicated because it's a stereo pedal, but both sides is with the exactly same problem. The only one logical explanation i could imagine is both IC is fried. I also tried a TL072 (i removed from the old board) but the problem stays.
If i remove the IC i have loud signal at output but it is clipping.
Anyone has a suggestion?

Measurements:
1:0.57V
2:1.49V
3:0V
4:0.69V
5:0V
6:4.2V
7:4.2V
8:5V
Yes, the right side is with a high voltage level than the left. I don't know exactly why, but it seems to be about 4V in all opamps while left side is about 1.5V.

P.S.: I just soldered a 4558 replacing the 272 and it works exactly the same. Low sound at output. So, i can conclude that the 272 is okay.

[bluebunny]

Those voltages look wrong.  The schematic shows the opamp (U17) has a bipolar power supply, so I would expect to see -5V/+5V at pins 4/8, and 0V at the inputs and outputs (the non-inverting inputs are at ground).

[GiovannyS10]

Marc, you are the most awesome lagomorph in the story of diysb.  I looked for this schematic all around the internet and couldn't find. When i found something was a broken link. I don't know where you could find it but thank you very much. With the schematic i had to trace that damn circuit anymore and found easy a problem at U15, C49 and C50. Replaced it and now it's back to life.

Thank you very much, dude. Saved my day.

[bluebunny]

Lagomorph - you say the sweetest things, Gio!   

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