Today on "Why isn't this crap doing what it's supposed to do!?": This is the "1.2V rail" on this board. I've never seen a hot iCE40 before.pic.twitter.com/z04jZOs3cu
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Schematic shows a 5V to 3V buck switcher and then a 3.3V to 1.2V Linear regulator. Are you getting 2.5V on the Switcher output?
I measured 3.3V on the input to the linear regulator (pin 3 on U10). The picture above is directly measured on U10 output (pin 2).
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2.5V is a diode drop from 3.3V. I wonder if 3.3V rail is feeding current into a non-existent 1.2V rail via a diode drop inside the FPGA.
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More likely scenario is wrong part was stuffed. MCP1700T-2502E/TT is a 2.5V LDO . Is that possible ? Impossible to read on SOT23 of course
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