Redpitaya Forum

Last week, I ordered a STEMLab 125-14 Starter Kit from mouser.com. After opening the box and connecting the included 5V microUSB power supply to the PWR connector, nothing happened. No LED lights came on.

I inspected the PCB very closely on both sides, but I don't see any damage or missing components. There is no obvious reason for the problem.

Next, I looked at the schematic and started probing the DC-DC converter circuitry at the LTC3615 ICs. All of the voltages seem to be OK, except +3.3 V. Instead, +3.3 V measures -0.4 V. Also, the PGOOD output from the LTC3615 is low (pulled to ground). As a result, the board will not boot up.

Thus, I received a unit with a broken +3.3V output. I contacted Mouser, and they told me to contact Redpitaya for help. I need a replacement unit for work, so I cannot wait a long time to go through the RMA process.

Please help.

I am surprised to hear Mouser refused a return. Have you checked against their terms of sale?
If they still do not accept this, I am sorry for the inconvenience, please contact us on our support email.
We do use fast couriers so the replacement to be done as fast as possible.

Yes, Mouser completely refused to help. I called DigiKey, and they said they would accept a return. Unfortunately, DigiKey is not restocking RedPitayas. But I will not be doing business with Mouser in the future.