This small 6 pin component seems to have been ripped-off while I was handling my pt alpha board.
I tried to look through the schematics for the board, but I can’t determine precisely what this component is used for.
Is is safe to power the board on, and what are the affected functionality ?
This is one of the dual MOSFET chip, probably the one that controls the DONE LED.
In this case the board will work except the for the LED.
But there is also one that is used as part as the power supply, in which case the board will probably not power-up at all,
and the last 2 are used for the FPGA-FTDI communication in FIFO mode.
Actually it’s U6 in the schematic on page 8. For some reason the U6 label is upside down…
It is the flash memory for the FTDI chip. It tells it what USB descriptors to use (“Alchitry Pt V2”) and is how Alchitry Labs knows what type of board you plugged in.
From your pictures, it looks like the pad for pin 6 was ripped off but the others are still intact? If that’s the case, you can likely just solder it back on then jump pin 6 to the top of the resistor closest to it. That also connects to 3.3V.
EDIT: It’s safe to use the board without it but it won’t be recognized by the software anymore.
I’m happy to report that the component seems in fact to be the mosfet chip controlling the done led, as the led won’t power on but the board is still recognized by the alchitry loader !
Thank you both for your help
Oh wow yeah my bad. I would’ve bet money it was the EEPROM but I just double checked the layout and you’re right. I got tripped up because the EEPROM on the Au is right there and it has a very similar package.
My apologies @gc74, you know the boards better than me apparently 
If you want to fix it, my suggestion would actually still work. Here’s what the bottom copper looks like. You can just jump it to the neighbor pin or to the nearby side of the resistor.
