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Visitor ernte23
Visitor
7,644 Views
Registered: ‎03-07-2012

kc705 Power Supply Issue - only 5.0V works

Hey guys, 

 

I have the following issue with a Kintex 7 - kc705 board: 

After removing the uart cable (in the operating board), the LEDs turned off and the fan stopped working (and I suddenly smelled something burned). It was working perfectly fine before. It could also be a short from the backside.


We measured the power supply of the whole board and it turned out, that only 5.0V and 12 V are working. 3.3V, 2.5V, etc.. are all either wrong or zero.
For the three control ICs on the backside, the PWM signal didn't work (the pwrctl*_vcc**_pwm). The others like the fault signals were allright.

Does anyone have any ideas ?  Possible fuses ? 

Regards and thanks in advance

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9 Replies
Xilinx Employee
Xilinx Employee
7,639 Views
Registered: ‎07-23-2012

Re: kc705 Power Supply Issue - only 5.0V works

Since you mentioned a burn, I expect that some high voltage might have damaged the power regulators on the board.

Please follow the debug steps given under board debug in http://www.xilinx.com/support/answers/50079.html#board to determine the state that the board is in.


If the board is under warranty (90 days from the date of arrival), I would recommend you to file a RMA ticket.

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Visitor ernte23
Visitor
7,632 Views
Registered: ‎03-07-2012

Re: kc705 Power Supply Issue - only 5.0V works

thanks for the fast reply. I expected a damaged regulator as well, but I just don't know which one or where the regulating device is placed, since not only one certain voltage isn't supplied anymore, all except 5.0V (and 12V) are broken.

Thank you as well for the link. I did it till step 2:a). Board Power : Power-on LEDs:

DS14 : OFF : FMC Power good
DS21:  OFF : FPGA init_b
DS22:  ON  : 12 V PWR
DS23:  OFF : UCD Power Controller

DS24:  OFF : TPS74901 PWR GD 

So all except the 12 V power are off. 

Any suggestions where to look ?

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Xilinx Employee
Xilinx Employee
7,626 Views
Registered: ‎07-23-2012

Re: kc705 Power Supply Issue - only 5.0V works

You can follow the instructions given in the pdf attached to http://www.xilinx.com/support/answers/56811.html and reprogram the power regulators. If this doesn't help then you should consider filing a RMA request.
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Xilinx Employee
Xilinx Employee
7,614 Views
Registered: ‎07-31-2012

Re: kc705 Power Supply Issue - only 5.0V works

Hi,

 

You can checkk the voltages using the TI power designer GUI to see which of the power controllers or LMZ modules failed.

 

You can cross check with pg  36 and 37 of the schematics for the power controller and the LMZ module outputs for referennce which to compare with the power designer gui- link

Thanks,
Anirudh

PS: Please MARK this as an answer in case it helped resolve your query.Give kudos in case the post guided you to a solution.
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Visitor ernte23
Visitor
7,557 Views
Registered: ‎03-07-2012

Re: kc705 Power Supply Issue - only 5.0V works

Hey, 
 

I tried to reprogram the regulators, unfortunately that didn't work either. 
Here is the first Error and attached the log file. All the other errors look similar (just with 1.000 V and 2.500 V)

"READ_VOUT on rail #1 (0,003 V) was not within 3% of VOUT_COMMAND (1,000 V)"

I can't request an RMA since the warranty expired already. 

I appreciate any ideas or solutions or ideas for solutions. 

Thank you

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Xilinx Employee
Xilinx Employee
7,551 Views
Registered: ‎01-03-2008

Re: kc705 Power Supply Issue - only 5.0V works

In your original post you wrote:

>and I suddenly smelled something burned

 

You have damaged components on the board and these will need to be replaced.

------Have you tried typing your question into Google? If not you should before posting.
Too many results? Try adding site:www.xilinx.com
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Visitor ernte23
Visitor
7,429 Views
Registered: ‎03-07-2012

Re: kc705 Power Supply Issue - only 5.0V works

Well, I already changed two of the components: one differential amplifier (since the output was not in the mentioned range) and a Power Train Module (one output signal was wrong). These operations didn't reach the target ... 

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Observer lucian.priscu
Observer
2,271 Views
Registered: ‎11-02-2012

Re: kc705 Power Supply Issue - only 5.0V works

Did you manage to to turn it on again? I have same issue but without burning something.
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Community Manager
Community Manager
2,201 Views
Registered: ‎07-23-2015

Re: kc705 Power Supply Issue - only 5.0V works

@lucian.priscu Always open a  new thread to get quick response. Can you open a new thread and state what exactly is the problem you encountering. 

- Giri
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