Zybo Z7 Will Not Power On

[postmaster87]

Hello,

We had a couple embedded systems projects using the Zybo Z7 and on the demo day a group was frantically trying to test their design and plugged something in backwards and the Zybo will no longer power on. I tried to get specific details from the group but failed to get any useful information from them. I've done a visual inspection and there are no burn marks or obvious shorts on the board. I've set all jumpers correctly and am trying to power over USB but it is not recognized under device manager and there are no "hot spots" present on the board either. Any suggestions for further troubleshooting would be greatly appreciated.

 

Best Regards,

Matt 

[jpeyron]

Hi @postmaster87,

Welcome to the Digilent Forums.

1) How are you powering the Zybo Z7?

         a) Is JP6 iset to USB?

2) Is JP5 set to JTAG?

3) Have you tried using a different USB A to Micro B cable?

4) Have you tried using a different USB port?

5) Does PGOOD LD 13 light up when the Zybo Z7 is turned on?

    a) If not I would like to check the power rails coming out of the power regulator.

         1) with a DMM please measure the voltage on the following capacitors:

                Either C219, C220, C221 or C222 (should be 5 V)

                Either C228,or C229 (should be 3.3 V)

                C237 (should be 1.35 V)

                C240 (should be 1.8 V) 

best regards,

Jon

[postmaster87]

Hi Jon,

Thanks for the quick reply. Here are the answers to your questions:

 

[postmaster87]

1.) USB A-Micro and JP6 is set tto USB

2.) JP5 set to JTAG

3.) Yes. Tested with multiple known working cables

4.) Yes. Tried multiple computers as well.

5.) No

6.)C222:C219 are all at 5V, C229:C228 both at 16mV, C237 12mV, and C240 16mV, which I'm guessing is not a good sign at all. Please advise possible options/solutions.

Thanks,
Matt

 

 

[jpeyron]

Hi @postmaster87,

This sounds like the power regulator is broken. I will send you a PM concerning this.

best regards,

Jon