09-05-2014 03:26 AM
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
09-05-2014 03:34 AM
09-05-2014 05:09 AM
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 ?
09-05-2014 06:04 AM
09-05-2014 11:46 AM - edited 09-05-2014 11:53 AM
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
09-11-2014 06:18 AM
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.
09-11-2014 08:04 AM
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.
09-22-2014 08:52 AM
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 ...
03-22-2017 04:32 AM
@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.