Forum Discussion

dpenev's avatar
dpenev
Icon for New Contributor rankNew Contributor
7 years ago

How to bring up FPGA board with short in the power rails.

Hello, I am trying to bring up few new prototypes using Stratix IV FPGA (EP4SGX70HF35C3N ) One of board is working fine. I have trouble switch the other one. Almost all power rails going to the FP...
AnandRaj_S_Intel's avatar
AnandRaj_S_Intel
Icon for Regular Contributor rankRegular Contributor
7 years ago

Hi,

Debug steps

Check board for Solder Bridging (Specially near all power, ground pins).

Method -1

Force current and measure voltage(FCMV) which will help in finding the short.(source-measurement unit /Parametric-measurement unit/multimeter with high Resolution.

Method-2

You apply power, and look for a temperature rise on a specific component. It works quite well.

Method-3

Removing components.

  1. List down the components on power rails(Regulators and passive components) try to suspect the component.(In my view i will suspect the 2.5V, 1.8V, 0.9V and 1.5V start heating DC-DC regulators->passive components ->FPGA)
  2. If possible can we desolder the regulator and check.If short persist,
  3. Try to do same for passive components on regulators and FPGA side.

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Best Regards,

Anand Raj Shankar

(This message was posted on behalf of Intel Corporation)