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

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jwilly's picture
jwilly
Junior(0)
Power fails on AES-ZU3EGES-1-SK-G boards

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?

JFoster's picture
JFoster
Moderator(55)
Hello Jwilly,

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

jwilly's picture
jwilly
Junior(0)
Hi Josh,

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

JFoster's picture
JFoster
Moderator(55)
Hi John,

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

jwilly's picture
jwilly
Junior(0)
Hi Josh,

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
 
 

JFoster's picture
JFoster
Moderator(55)
Hi John,

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

jwilly's picture
jwilly
Junior(0)
Hi Josh,

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
 

JFoster's picture
JFoster
Moderator(55)
Hi John,

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

jwilly's picture
jwilly
Junior(0)
Hi Josh,

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
 
 

JFoster's picture
JFoster
Moderator(55)
Hi John,

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

abushuev's picture
abushuev
Junior(0)
Power fails on AES-ZU3EGES-1-SK-G boards

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. 

JFoster's picture
JFoster
Moderator(55)
Hello John and Abushuev,

Hello John and Abushuev,

We have determined the issue. This issue lies with the amount of current we were supplying onto the SOMs IR part. We have made a change in the BOM that will take place on our next Production SOM build that will eliminate this issue (Will be available mid-July). Seeing as we currently do not have any UltraZeds currently in stock, we are willing to offer our services in getting the reworks done to eliminate this issue on your boards. Please message me if you would like help with this.

Thank you,

Josh

 

abushuev's picture
abushuev
Junior(0)
We have done the rework by

We have done the rework by ourselves; the board works fine.

Thanks for response!

Andy1988's picture
Andy1988
Junior(2)
Hi Josh,

Hi Josh,
Are you going to post an errata document like for the PicoZeds so that I can do the rework by myself?
Thanks,
- Andy

JFoster's picture
JFoster
Moderator(55)
Hello Andy,

Hello Andy,

Please refer to your private messages.

Thank you,

Josh

ca_tex-djohnson's picture
ca_tex-djohnson
Junior(0)
same issue

We have the same issue here.  Was using UltraZed-EG SOM w/ IOCC just fine for weeks.  Fan suddenly shut off, so I looked at board, only D10 green LED on, everything else off.  Measured voltage at PWR_DISABLE, 0.5v.  Similar result for this SOM w/ PCIe CC.  Can you PM the rework instructions for our tech please?  Thanks.

JFoster's picture
JFoster
Moderator(55)
Hello ca_tex,

Hello ca_tex,

Please refer to your private messages. I have messaged you the instructions.

--Josh

dtesdall's picture
dtesdall
Junior(0)
Josh,

Josh,
I have an UltraZed SOM and starter kit that I believe is experiencing the same problem. The board was working fine and then stopped. I am a software engineer, so I am not able to check voltage levels, but I would be interested in a copy of the instructions as well.
Thanks

JFoster's picture
JFoster
Moderator(55)
Hello dtesdall,

Hello dtesdall,

Please refer to your private messages. I will mesage you the remedy.

--Josh

horv's picture
horv
Junior(0)
Josh,

Josh,

 

Can you please send me the rework instructions as well? Thanks.

 

JFoster's picture
JFoster
Moderator(55)
Hello horv,

Hello horv,

Please refer to your private messages. I will mesage you the remedy.

--Josh

harpun's picture
harpun
Junior(0)
Josh

Hi Josh,

I have UltraZed-EG Starter Kit and I follow instruction in Getting Started Guide, but when I turn on the power (switch J7 on Carrier Card,12V), only D10 green led  is on, fan is not working and everything else. Please message me if you would like to help with this.
Thanks

JFoster's picture
JFoster
Moderator(55)
Hello Harpun,

Hello Harpun,

What version of the board do yo have? The production (Black Boards) or ES1 (Red Boards). Did you make sure that JP1 Shunt on the SOM is not installed? See this post: http://zedboard.org/content/ultrazed-som-power-regulator-shunt

--Josh

harpun's picture
harpun
Junior(0)
I have not seen this post

I have not seen this post before. Thanks for it. I removed JP1 Shunt on the SOM and it worked. Thanks so much for help!!!