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I wanted to thank you for your assistance, but I just ended up buying a replacement board where everything worked, for a very decent price.

Well, I replaced U2890 and still nothing. The MacBook still shows the Thunderbolt controller, but doesn't detect anything plugged into it. I suppose I could replace U2800, but I don't think it's worth it at this point, not to mention if I did and it didn't work...

Don't know if it is helpful, but here are all the voltages from U3220 measured at the IC: U3220 DP_TBTPA_AUXCH_N Pin 1 = 0.986 DP_TBTPA_AUXCH_P Pin 2 = 0.583 PP3V3_S4_TBTAPWR Pin 3 = 3.236 DP_TBTPA_DDC_DATA Pin 4 = 0.029 DP_TBTPA_DDC_CLK Pin 5 = 0.788 TBT_A_DP_PWRDN Pin 6 = 0.956...

Just FYI, Tried swapping U3220 from donor board and no change.

So, measuring TBT_A_HPD at J3200 (pin 22) I get ~3.3V. Measuring DP_TBTPA_HPD at U3220 pin 12 (TP[1]DP_TBTPA_HPD), I only get 0.098V. Does that indicate that most likely U3220 (and U3320) are bad?

Another thing, I was checking Q8000 (per https://repair.wiki/w/A1398_2015-2016_15%E2%80%9D_MacBook_Pro_Retina) and noticed that P3V3S3_S4 is 0V. PP3V3_S4 and PP3V3_S5 are both ~ 3.3V.

Ok, so first, I must have been measuring the HPD on the wrong pin. From the Test Points, DP_TBTPA_HPD or DP_TBTB_HPD does NOT go high when monitor (mini-DP) is connected (max 0.1V) to either port. Here are the measured voltages on the corresponding IC: U3210 V3P3OUT (pin 18) = 3.287 OUT...

Thanks for the reply. I'll have to take those measurements this evening after work.

I have an 820-00163-A logic board that does not detect Thunderbolt devices or output video via DisplayPort on either port A or B, HDMI output works. ThunderBolt shows in System Profiler, no devices connected. Checked HPD voltage goes to ~3.2V when DisplayPort is connected but stays 0.0V when...