mhmt9851

Hi @JColvin, I measured C94 and its 3.25V. Also for it to work, after switching the power on i need to press the ps-srst button one time. After that, every time i press ps-srst it programs itself successfully, until i switch the power back off. But it only works maybe one in ten. It used to program itself directly after switching the power on. This does not happen in sdcard mode. It programs itself immediately. Lastly i dont know if its related but when i switch the power on sometimes LD6 flashes red for a short time. Thanks, mhmt9851

Hello, While working with Zybo Z7 board, i accidently connected 5V to 3.3V power pin of Pmod port JE. Similar to these threads; https://forum.digilent.com/topic/17695-zybo-z7-10-qspi-flash-programming-mode-broken/ https://forum.digilent.com/topic/18202-zybo-z7-will-not-power-on/ https://forum.digilent.com/topic/21497-zybo-z7-pgood-led-is-not-on-no-devices-detected-on-target-in-vivado/ At first the pgood led was flashing, and Vivado did not detect the board. I did not use the board a couple of days. Now in jtag mode pgood led stays on and Vivado detects the board. I can program the device in jtag mode. pgood led stays on in qspi mode but the oob demo program does not boot. Sometimes it works, sometimes it does not, and sometimes pgood led turns off and instantly turns on. in sdcard mode the oob demo works. Taken from this thread : https://forum.digilent.com/topic/18148-zybo-z7-20-factory-demo-program/ I think the qspi flash works, because sometimes it boots correctly and the oob demo starts. So the issue must be in the power regulator. Can you help me troubleshoot the issue. Maybe i can replace some parts and fix it. I measured the voltages of capacitors from the linked thread; C219, C220, C221, C222 are 4.53V C228, C229 are 3.26V C237 is 1.34V C240 is 1.79V