the FB Pin is the Feedback it controls the Vcore on your card the pic is correct this is the Fb pin so now you have to find the resistor that is connected with the Fb pin on your 3850 for start and then i will tell you what to do
just take a multimeter and see witch resistor measures 0Ωhms with the FB pin
post a good pic of your card it will help us a lot
ok try measuring those resistor and see witch one shows 0Ωhms with the FB
if you cant put you multimeter prob on the FB pin because the are tiny you can put it on the capacitor that is connected to the FB see the trace line in the image that leaves the FB pin and goes on the tiny brown smd capacitor
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