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Thanks, I'm expecting the donor board to arrive on Saturday so will hopefully have a go at replacing U7800 over the weekend. I'll let you know how I get on. Have a lovely weekend.

Voltages at LDOs: LDO0 = 0.000V LDO1 = 0.000 - 0.003V LDO2 = 0.000V LDO3 = 0.000 - 0.001V LDO_CORE = 0.000V LDO_RTC = 0.000V mostly with a little 20mV ramp up and down each time the USB-C ammeter cycles VOUT_RTC = 0.450V (starts lower at 200mV and each time the ammeter cycles it rises a bit...

Okay I checked all the pins in Sym 1 of 4 section as follows (all with red lead to ground): V3P3/VOUT_RTC = 0.377 LDO0_IN = 0.253 LDO1_IN = 0.416 LDO2_IN = 0.392 VIN_RTC = 0.415 LDO_CORE = 0.367 LDO0 = 0.214 LDO1 = 0.468 LDO2 = 0.527 LDO3 = 0.595 LDO_RTC = 0.368 HIO_SW_EN = 0.473 HIO_SW = 0.222...

Hi, thanks for the welcome, and for the fast response. Diode mode readings for R7900 (I presume you meant that and not R9700) are 0.417 (red lead on ground) and 0.753 (black lead on ground). This is with my link wire still attached between R7900 pin 1 and 2. Do you want me to do the same...

Hi, My wife's 2019 MBP died a couple of weeks ago and I have been trying to figure out what is wrong with it. I took it to Apple who diagnosed a logic board failure and quoted me around £700 to replace even though it's just a few months outside AppleCare warranty... I have an electronics...