tom tilmon
Member
Greetings PJRC,
My partner and I are trying to complete a project using the PJRC Teensy 4.0 with the Audio Shield Rev D. We initially ordered 20 of each unit. Of those 20, 5 had short issues upon assembly with the header pins. The issue is a short between GND and 3.3V. I have tested with a multi-meter. The boards that have worked have not had continuity between GND and 3.3 pads. I was able to successfully program them, and they work as expected. Tonight, I assembled another Teensy 4.0 and Audio Shield. I tested Teensy and Shield for shorts prior to joining them. I also plugged in the Teensy 4.0 to computer prior to assembly, and it is recognized. However, once I join the 2 boards with the header pins, I have short between GND and 3.3V.
Our source code is the ProffieOS by Fredrik Hubinette with MiCom Prop file. The entire OS can be found here: ProffieOSIt is extensive, and I don't want to post it all here, as its irrelevant to the problem, and when the boards don't have this short, they work fine on the ProffieOS.
Here are some photos of the joined pair:
Topside Image Original
Bottomside Image Original
Any help or guidance is appreciated. I don't understand why some of the boards work fine, and some don't. I do have pretty decent experience in joining Teensy 3.0s with Fredrik Hubinette's Teensy Saber sound shield. Not sure why we are getting this short on some of the boards.
Tom
My partner and I are trying to complete a project using the PJRC Teensy 4.0 with the Audio Shield Rev D. We initially ordered 20 of each unit. Of those 20, 5 had short issues upon assembly with the header pins. The issue is a short between GND and 3.3V. I have tested with a multi-meter. The boards that have worked have not had continuity between GND and 3.3 pads. I was able to successfully program them, and they work as expected. Tonight, I assembled another Teensy 4.0 and Audio Shield. I tested Teensy and Shield for shorts prior to joining them. I also plugged in the Teensy 4.0 to computer prior to assembly, and it is recognized. However, once I join the 2 boards with the header pins, I have short between GND and 3.3V.
Our source code is the ProffieOS by Fredrik Hubinette with MiCom Prop file. The entire OS can be found here: ProffieOSIt is extensive, and I don't want to post it all here, as its irrelevant to the problem, and when the boards don't have this short, they work fine on the ProffieOS.
Here are some photos of the joined pair:
Topside Image Original
Bottomside Image Original
Any help or guidance is appreciated. I don't understand why some of the boards work fine, and some don't. I do have pretty decent experience in joining Teensy 3.0s with Fredrik Hubinette's Teensy Saber sound shield. Not sure why we are getting this short on some of the boards.
Tom
Last edited: