Mach 1 no sound when engaged

[ADAOCE]

Have a Mach 1 that has no sound at all when engaged. Bypass and LED work fine. I’ve checked my solder joints. Didn’t see any cold looking joints. I touched up a few resistors so that the solder penetrated both sides. I even tried a different opa2134 and a tl072.

I’ve recorded the following IC voltages with the opa2134

1: 4.46
2: 5.03
3: 0
4: 0
5: 0.16
6: 0.59
7: 4.46
8: 8.2

I’ve attached some pictures of the board from the top side. I know it could use an IPA wipe down but to be honest that’s never resulted in an issue like this for me and I’ve done ones that looked worse.

mill have to wait til tomorrow to get a picture of the underside (I stupidly didn’t take a picture when I pulled it out to reflow joints). Underside looks better than top though since that’s the side I soldered from.

anyways I’m just hoping these ic voltages are enlightening. TIA

 

[ADAOCE]

I’ll give this another good cleaning tomorrow. I found a tiny little plastic bristle brush that should do much better at cleaning all the crevices. There are no visible solder bridges so it must be some tiny speck stuck in the flux somewhere.

 

[Chas Grant]

it could be in which case we are chasing are tails. Try some of that electronic cleaner, it works wonders, just dont spray it on the fron of board, if the cap values are just printed on it eats the ink. I spray the brush then scrub the front.

 

[ADAOCE]

Ok sounds good man thanks for your time tonight enjoy the rest of 2020!

 

[Chas Grant]

Anytime, I like a challenge, and this is a good one. Have a safe New Year!

 

[ADAOCE]

Cleaned the living hell out of this board and still no dice I’m just going to start replacing parts lol

 

[ADAOCE]

So I replaced R102 because I thought one of the joints looked suspect and then I swapped in a new C1. Am I right in the basic thinking that Vref isn’t being obtained because some component in the circuit is pulling down the voltage before it hits the IC? Are the caps the likely culprits? I can just try swapping a bunch out but I’m wondering if one or two might be more likely to cause the issue.
I’m playing it right now and the clipping section sounds really good and the volume is actually not terrible. The screwy part is that if I roll the tone all the way down it’s really quiet. I’ve tried it with other pedals like my klone and I can get some decent sounds stacking but it just seems like there’s a bass cut or volume drop when I turn the Mach 1 on. Is that typical for the lightspeed?