Problems with a PT2399 delay project

[MarkL]

I received a PCB (not a MBD project) for a PT2399 delay.  I populated it and powered it up.  For about 2 seconds, it passed a signal with repeats....then stopped working.  I replaced the regulator (78L05), put in a new PT2399, and the same thing happened.

I took voltages on every pin of the 2399 -- and got 0.0 on every one.  Anybody know where something is going wrong here just from this info?

[Luke51411]

More info is needed, first of all what circuit is it? A link to a schematic or build doc would be good. Read the debug thread here. Check for bad solder joints/bridges. Check continuity for power and ground.What are the voltages at the regulator? Photos of both sides of the board could be helpful as well.

[TNblueshawk]

Any chance the PT's are from Tayda? If they are and you have more pop in a few more just to rule that angle out real quick.

[pickdropper]

Is the digital ground and audio ground on the chip tied together?  I believe those are pins 3 and 4.  I would check that.

[gtr2]

Schematic?

[MarkL]

Nevermind...fixed it.  Chip installed upside down.  Mea Culpa.