Cupcake - no voltage anywhere

[astrondelta]

Hi there... I've got a serious cupcake problem.  Short intro, I'm pretty much an intermediate builder at this point, I've built a some madbean, guitarpcb, byoc, and ggg projects, but most of what I do is veroboard. As such, I've done a lot of troubleshooting and I have a pretty good idea of what I am doing.  So this problem's got me stumped.

I decided I was going to build an effect in an Altoids box, since I have about a million of them.  I dug through my drawer and found the cupcake... populated it, wired it up, and then went to test the voltages before sticking in the opamp and resistor.  I get no voltage anywhere on the board.  I tested my DC jack when i installed it, and was getting about 9.5v between ground and positive.  Now, with the circuit wired to the DC jack, I get no voltage between the lugs on the DC jack, and, like I said, no voltage anywhere on the board.  This tells me there's a short somewhere that's pulling 9v to ground.  Following the circuit, I started pulling parts, first the filter cap C8, then the rectifier diode D2. Probed pin 8 of the opamp socket which should be +9v, and got 0. Probed R7 which should have +9v at one side and got nothing. Lifted R7, nothing. 

I visually inspected the entire thing, but as it's a through-hole, double-sided board, it's cake to solder and wire compared to most of what I do. I reflowed every solder joint, checked for solder bridges (and had another much more experienced EE check for the same) and I still have a short somewhere. At this point I'm fairly convinced there's a short between supply and ground somewhere on the PCB, possibly a manufacturing error.  I could remove every component but I'm fairly sure that won't change anything. I've purchased many PCBs through madbean and this is the first one I've found bad. Is there a remedy for such a situation?  Is there a troubleshooting step I'm missing?

Thanks.

[midwayfair]

Do you actually get continuity to ground from the 9v pad on the PCB?

You'd still get voltage at the +9v in pad even if voltage was getting sucked to ground. You'd just ALSO have a component heating up somewhere on the PCB ... so this says to me that there's something wrong with the jack or wire that's carrying DC to the PCB.

[astrondelta]

Good question, and one I tried a bunch of ways to answer, and the answer is, sort of.  I tested this a bunch of times because I was expecting continuity with what I was seeing, but I don't get perfect continuity between ground and the +9v pad with my continuity test on my DMM. It's pretty close, so it doesn't "beep," but it does show some sort of small voltage differential, as it would if I was testing a diode or something with some continuity. 

If I remove the wire from the power jack, I get ~+9.5 between ground and the lug.  The instant I connect the wire from the board to the lug, I get 0. I do get continuity between the power jack lug and the +9v solder joint on the board, and between the wire end and the solder joint on the board, and ground is working throughout the board.  Nothing is heating up that I noticed... I didn't rest my hand on anything specific to check this, but nothing smoked, and I touched or probed everything on the board and don't remember any particular hot spots.