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Plugged into corresponding ports. PP1V8_UPC_XA_LDOD=1.8V PP3V3_UPC_XA_LDO=3.3V PP1V8_UPC_XA_LDOA=1.8V PP1V1_UPC_XA_LDO_BMC=0V PP1V8_UPC_XB_LDOD=0.5V PP3V3_UPC_XB_LDO=1.5V PP1V8_UPC_XB_LDOA=0V PP1V1_UPC_XB_LDO_BMC=0V PP3V3_G3H=0.1V when plugged into port corresponding to B and 2.9V when plugged...

Readings after replacing U3100 Faulty board (diode mode): PP1V8_UPC_XA_LDOD=0.492V PP3V3_UPC_XA_LDO=0.506V PP1V8_UPC_XA_LDOA=0.534V PP1V1_UPC_XA_LDO_BMC=0.530V PP1V8_UPC_XB_LDOD=0.494V PP3V3_UPC_XB_LDO=0.495V PP1V8_UPC_XB_LDOA=0.535V PP1V1_UPC_XB_LDO_BMC=0.529V Faulty board (Voltages)...

Replaced U3100, I now have PPDCIN_G3H=5V. PP3V3_G3H is ~2.9V. When I plug the USB C power meter in to the port connected to U3100 I get 5V and ~400mA but on the port connected to U3200 I get 5V ~170mA. Does that sound like U3200 is bad as well or that I goofed soldering U3100?

You're right of course :) It was U3100. Now I gotta do some reballing. Thanks a lot for the help.

Good board (diode mode): PP1V8_UPC_XA_LDOD=0.483V PP3V3_UPC_XA_LDO=0.515V PP1V8_UPC_XA_LDOA=0.525V PP1V1_UPC_XA_LDO_BMC=0.520V PP1V8_UPC_XB_LDOD=0.484V PP3V3_UPC_XB_LDO=0.515V PP1V8_UPC_XB_LDOA=0.525V PP1V1_UPC_XB_LDO_BMC=0.520V Faulty board (diode mode): PP1V8_UPC_XA_LDOD=0V...

No short on PPDCIN_G3H Faulty board PP3V3_UPC_XA_LDO=0.486V PP3V3_UPC_XB_LDO=0.498V Good board PP3V3_UPC_XA_LDO=0.515V PP3V3_UPC_XB_LDO=0.515V No short to gnd on that line. Using a good 87W charger and cable.

PP20V_USBC_XA_VBUS=5V but PPDCIN_G3H=0V. Don't I need this rail before U7000 is suspect? The power system on these boards makes my brain hurt.

R7020 is 0V. Resistors are OK and have continuity to U2890.

Hi, I have dead 820-00840. It had liquid damage around U2890 which I cleaned up and ran jumper wires etc. 5V on the USB C power meter. I have: PP3V3_G3H = 0.17V PM_EN_P3V3_G3H_R = 0V Neither are short to gnd. Any help from here would be appreciated.

Do you mean PPVCCGT_S0_CPU is the last voltage to appear? I suppose I could try flashing an EFI dump if I can find one. Can you think of anything else to try?

No luck with the reflow. I have been reading the datasheet for SiC631 (U7410). The actual chip on the logic board is SiC635 but I can't find the datasheet for it and this one seems functionally the same. If I understand it correctly, the SiC chip (U7410 etc) needs communication from the...

Cheers, there is no short I was probing the wrong pin. I'll reflow U7800 with some amtech.

Scratch that. The boardview for this model is screwed up on those sic chips so I was counting the pins manually. I didn't realise that a pin is skipped on the bottom edge so I had the wrong pin which was gnd :( Looking at the datasheet for the sic631 since I can't find the datasheet for the 635...

Got an update. PP5V_S0 is missing from pin 29 of U7410 and the other phases of my missing rails. There is a 0.2R short to gnd on that line. Now I just have to figure out where the short is.

Wow, sorry again. I'm sure that was my mistake. I have just taken all the readings again. PMIC_SHUTDOWN_L = 3.27V PM_SLP_S0_L = 3.08V S5_PWRGD = 3.32V P5VS4_PGOOD = 3.32V PM_SLP_S3_L = 3.35V P1V8SUS_PGOOD = 3.29V PM_SLP_S4_L = 3.35V PM_SLP_SUS_L = 3.35V CPUVR_PGOOD = 3.31V

Pmic_shutdown_l = 3.3v pm_slp_s0_l = 3.08v s5_pwrgd = 3.3v p5vs4_pgood = 3.3v pm_slp_s3_l = 3.3v p1v8sus_pgood = 3.3v pm_slp_s4_l = 3.3v pm_slp_sus_l = 3.3v cpuvr_pgood = 3.3v pm_slp_s0_l = 0v

68R to gnd on PPVCCEDRAM_S0_CPU 5.8R to gnd on PPVCCGT_S0_CPU The spill was at C7837. Had to run a jumper from pin1 C7837 to pin1 C7838. Replaced C8000 and C7962.

Apologies, I just double checked my readings. I get 1.05V at L7700 and at pin5 of U7760. Corrected: U7760 Pin1: 5V, pin5: 1.05V, all other pins 0V

U7760 Pin1: 5V, all other pins 0V U7790 pin6: 1V, all other pins 0V

Hi, This is a liquid damage board. The board turns on but does not POST. I have all the S0 rails except PPVCCGT_S0_CPU AND PPVCCEDRAM_S0_CPU. I'm struggling a bit to figure out how the voltage regulator circuits on these newer boards are supposed to work. Any help would be appreciated.