EEVblog Electronics Community Forum

Electronics => Projects, Designs, and Technical Stuff => Topic started by: rozeh on December 02, 2013, 05:24:46 pm

Title: Problem in education FPGA Spartan III board(short circuit the AMS1117-1.2)
Post by: rozeh on December 02, 2013, 05:24:46 pm

.....................................

Title: Re: Problem in education FPGA Spartan III board(short circuit the AMS1117-1.2)
Post by: hans on December 02, 2013, 05:36:34 pm

Simple guess: check the soldering?

I note that the via's are placed closely to the QFP pins from the inside. I suspect there is no via tenting applied because I neither see them at the bottom layer. Typically VCC and GND pins are located next to each other, so it is very possible there is short behind the QFP pins somewhere on the board.

Have you checked the pinouts of all components? If one VDD/GND pair is off, you can also see a short on the entire rail.