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Board came in with all 4 CD3215 shorted to ground. Replaced all 4 with donor ones and now I get 20V only with battery connected but no charging. All LDOs present in all 4 ports. Without battery board takes 5V and around 0.080A and none of them are cycling power. U2890 and UB090 are working...

TPAD_SPI_BUS_EN Before 3.3V - After 0V TPAD_VBUS_EN Before 3.3V - After 0V

Clean board, trackpad/keyboard don't work either before or after OS loads, already tried known good trackpad/flex/keyboard even tested it on a different case and same thing. External mouse and keyboard does work fine Alt key doesnt work so no boot menu but even before boot there is no trackpad...

Not sure on this one as this is the first time I see such behavior

Yes and I even wrote a large file to it via target mode

SSD shows up in Disk Utilities on another Mac if I run first aid it works with no errors however I cannot see it in finder or any other SSD testing software.

Yes, same thing

Clean board already tested in known working case and same problem even with restored T2 and clean install of macOS. Sometimes shows folder icon, sometimes shows prohibited icon sometimes it gets all the way to the login screen but as soon as the password is imputed and hit enter the Mac...

Cleaned it in UC after the repairs I did and now board works, thanks a lot!

PM_SLP_S3_L is 0V but when I trigger SMC_ONOFF_L it pulses to 3.3V PP3V3_S3, PP3V3_S0, PP1V8_S3, PP1V2_S3 all 0V but do pulse when I trigger SMC_ONOFF_L

I do get a pulse on PM_SLP_S4_L when I trigger SMC_ONOFF_L, bypass same thing. One thing I noticed is that PM_SLP_S4_L and S4_PWR_EN pulses once at the correct voltage right after I connect charger.

Sorry, title corrected for board ID

Board had a little bit of corrosion around C2952 and PP3V3_S4 was shorted (C2952 and U8000) both replaced but I am missing PM_SLP_S4_L and S4_PWR_EN is only 0.310V PM_SLP_S4_L Diode 0.474 SMC_S5_PWRGD_VIN Present PPVRTC_G3H Present U1950 Pin 8 has 3.4V

I thought I had checked R7744/7 but they were off a little bit, replaced them and checked, but same thing. Checked with board alone even with no LCD flex cable connected (also checked the FPC and all good) but same thing.

Sorry about that I typed something else instead of the board ID 820-01987

Clean board, came with shorted U7710 and U8500 now I get 20V and 0.200A after a few seconds, I do get USB 5V but no activity. Restoring T2 takes a long time and eventually I get lock icon. Trackpad clicks but there is not light on caps lock. Battery was discharged and overnight it got charged...

Ok now I do have 20V in all ports without battery connected, I do have usb voltage and activity on left side, however on right side only UB300 has voltage and no activity, UB400 has none, I have already replaced UB000, UB090 with correct firmware, UB700, QB701, U8285, YB200, DB503 and both...

In its case board does indeed still boots fully, 20V with battery connected but wont charge. Left side has USB voltage and activity, right side is missing both, this gives me something to look for. With battery alone no trackpad I still dont get voltage on those 2 coils (remember this board...

I will install it into its case again and test, but it only boots with battery connected.

PP1V8_G3S missing not shorted, U8220 has power but missing enable signal PP1V8G3S_EN PP3V3_G3S missing too not shorted Tried a new PMU with same result