sage Posted April 27, 2018 Share Posted April 27, 2018 Hello. I have a zybo board that is not working. I was told that a 12 volt power supply was used instead of a 5 volt power supply. Is there anyway that it could be repaired e.g. changing a fuse or chip. thank you. Asim Link to comment Share on other sites More sharing options...
jpeyron Posted May 1, 2018 Share Posted May 1, 2018 Hi @Asim, You are correct that R281 is a fuse. You will need to replace R281 for the Zybo to work. thank you, Jon Link to comment Share on other sites More sharing options...
jpeyron Posted April 27, 2018 Share Posted April 27, 2018 Hi @Asim, Welcome to the forums. I would suggest to look at page 13 of the schematic here. I would first check the capacitors on the different power rails i.e. C222 on the 3v3, C227 on the 1v0 after the power regulator. Does the Zybo pgood light come on when powered on? We do not provide a repair service. We can help you narrow down where the issue is, but you would need to facilitate any repairs. thank you, Jon Link to comment Share on other sites More sharing options...
sage Posted April 28, 2018 Author Share Posted April 28, 2018 @jpeyron Hello Jon Thank you for helping me out. The pgood light doesn't come on. I have taken the voltages at different points which i thought might help. 0 volts at c213, c222, c223, c227, c228, c231, c234 2.1 volts at c215, c216, c217, c218 1.7 volts at c229, c232 2.1 volts at c225, c221 0 volts at R279, R264 2.1 volts at R261 Asim Link to comment Share on other sites More sharing options...
jpeyron Posted April 30, 2018 Share Posted April 30, 2018 Hi @Asim, How are you powering the Zybo? If its externally have you tried powering it through the usb. Have you tested your power source. If you are using a powered usb hub try using one of the usb's directly on the pc. You should be getting 5v on c215,c216.... Have you tried cleaning the power switch? thank you, Jon Link to comment Share on other sites More sharing options...
sage Posted May 1, 2018 Author Share Posted May 1, 2018 @jpeyron Hi Jon I was using a 5 volt external power supply before. I just tried it with a usb cable same results but i have noticed something. I get about 2 volts at the switch the same voltage is at c215/c216. when i turn the switch off i don't get any voltage on the other side of the switch i.e R261 but i still have 2 volts at c215/c216. I am getting the same voltage across D13 i.e about 2 volts I am getting a 3 volt drop across R281 which I think is meant to be a fuse. Link to comment Share on other sites More sharing options...
sage Posted May 2, 2018 Author Share Posted May 2, 2018 Thanks @jpeyron. I am tempted to short R281 and power it though usb to check if it would work before i order the fuse. any suggestions. Ok I couldn't wait so I shorted the fuse and the PGOOD light came on.I haven't carried out any further test. I will wait until the fuse arrives. Thanks once again. Asim Link to comment Share on other sites More sharing options...
jpeyron Posted May 2, 2018 Share Posted May 2, 2018 Hi @Asim, Glad to hear that it was R281. thank you, Jon Link to comment Share on other sites More sharing options...
sage Posted May 8, 2018 Author Share Posted May 8, 2018 Hi, just thought i should give an update. I replace the fuse and tested the board by running a small project using onboard switches and leds. seems to be working fine. Link to comment Share on other sites More sharing options...
jpeyron Posted May 8, 2018 Share Posted May 8, 2018 Hi @sage, Thank you for letting us know that your zybo board is working after replacing the fuse. thank you, Jon Link to comment Share on other sites More sharing options...
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sage
Hello. I have a zybo board that is not working. I was told that a 12 volt power supply was used instead of a 5 volt power supply. Is there anyway that it could be repaired e.g. changing a fuse or chip. thank you.
Asim
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