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Power fails on AES-ZU3EGES-1-SK-G  boards

100jwilly

After running I/O carrier board and module for about 4 hours the power to the boards failed.

This has occurred on another board set we using for development. Jumpers on IO carrier boards are in the correct positions and JP1 on SOC module is removed.

Led D10 VIN-HDR is on and led D9 PG-MODULE is off.

Tried cycling the power off and on but will not power up.

Has this been observed on other UltraZed boards? Any way to get this working?

  • 0

    Hello Jwilly,

    Could you please provide back some information:

    1.What is the voltage at the test headers on the carrier card when it fails?

    2.What is the temperature of the ZYNQ(You have a fan/cooling system installed correct)?

    3.What application are you running? One provided by Avnet or your own?

     

    No PG_MODULE means that one of the SOM rails went down for some reason. 

    Could you please check the SOMS power rails and provide back that information.

    The easy way to detect what happens to the SOMs rails is to be able to utilize an IR dongle to monitor the power supplies of both the SOM and IO Carrier Card to see what is causing the issue.

     

    The hard way to detect what happens is to use the schematic and probe the SOM power supplies. There are large capacitors and inductors on the SOM where you could probe the rails and measure the voltages of the specific rails to see if one of them went out of regulation. The schematic lists the required voltages of each rail.

     

    --Josh

  • 0 in reply to jafoste4

    Hi Josh,

    1) What is the voltage at the test headers on the carrier card when it fails?

    VMON Header

    -------------------

    Vin:                         12.07 V

    MGTRAVCC :        0.119V

    MGTRAVTT:           0.002V

    VCCO_1.8V :         0.031V

    +5V:                         0.019V

    3.3V :                       0.015V

    3.3V PRI:                3.285V

    Voltage rails on inductors and capacitors are same.

    2.What is the temperature of the ZYNQ(You have a fan/cooling system installed correct)?

    The temperature on the Zynq has always been cool when running  and the fan has been installed and operating correctly.

    3.What application are you running? One provided by Avnet or your own?

    U-boot and Linux kernel images from Xilinx GIT repositories with Debian filesystem.

    John

  • 0

    Hi John,

    Thanks for providing the the IO Carrier Cards power rails measurments.

    Will you now please measure the SOMs power rails measurments aswell. You can do this by measuring where the inductors/capacitors on the SOM power rails are located. Please refer to the SOMs schematic Our goal with this is to see wchich rail may not have been in proper regulation the SOM itself.

    The reason being why I would like the power measurments from the SOMs perspective is because the SOM controls whether the IO Carrier Card will turn on. This is indicated by the PG_MODULE LED. So when the PG_MODULE LED is not illuminated, the Carrier Card will not have it's power rails. As you can see this is demonstrated by the measurments you provided.

    Thank you,

    --Josh

  • 0

    Hi Josh,

    FWIW this is not easily done. The components are close together and it makes it very difficult to probe with the
    potential of shorting to another component. Each power rail was measured at least 3x.

    These are the measurement on the SOM module.

    L1 :         0.030V

    L2:          0.045V

    L3:          0.005V

    L4:          0.004V

    L5:          0.364V

    L6:          0.004V

    L7:          0.046V

    L8:          0.000V

    I would say this SOM module is dead.

    John

  • 0

    Hi John,

    I just want to clarify a few things, you are not attempting to perform power down states with software (even accidentatlly) correct?

    You can remove the accidental part by making sure the PMBUS Shunts and PWR_Disable shunts are remove, ie - do not shunt JP1,JP2, or JP3 on the SOM

    The only other item to look at would be +5VREG failing, U21 on the SOM. This can be measured at inductor L9, capacitor C223, or JP1 pin 1 (divided down version of +5VREG). In essence, by doing this we are measuring the un-shunted PWR_DISABLE signal which in turn controls the SOM power supplies.

    --Josh

  • 0 in reply to jafoste4

    Hi Josh,

    That is correct, there is no power system control in software, even accidently.

    I removed shunts  JP2, and JP3, JP1 was already removed. Same result as before, module is not powered.

    L9 :    4.991V

    J1-1 0.417V

     

    John

  • 0

    Hi John,

    Two more questions,

    1) Please measure the +VIN to the SOM. This should be 12V from the carrier. You can measure this at U21 pin 2 or various other caps around the board. C189 – C196. One side is ground, other should be 12V when the carrier is turned on.

    2) Also do you have another SOM to try with the same IO carrier card? Or as I read above, has this issue been replicated on two seperate SOMs?

    Thanks,

    Josh

  • 0 in reply to jafoste4

    Hi Josh,

    12V power to SOM module is present. Measured 12.03V at via connecting 12,13,14 on U19.

    The other IO carrier and SOM is not working, same problem.

    John

  • 0

    Hi John,

    It appears we will not be able to solve your issue over the forum. Would you be willing to send us one of your SOM and Carrier Cards for analysis?

    Thanks,

    Josh

  • 0
    The same issue with the board.
    The issue with the net "PWR_DISABLE"; it has about 0.5V. Also, it is not enough to enable the IRPS5401 ICs.
    (see the schematic AES-ZU3EGES-1-SOM-G-schematics.pdf)
    We've tried to apply 3V3_PRI (from the baseboard) via 500R resistor to the PWR_DISABLE net (JP1.1) and this rework helped to start the board.
    Please, review mentioned rework.