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USB_C does switch to 20v 3V3_G3H - 3.4 PPBUS_G3H - 12.6

I have this board, customer said it wasn't getting image to the display but did get image on external display. Once i started working on it, i noticed there was no usb-c activity on any of the port, which also meant no external display image. Started probing and noticed L7410 and L7421...

yep. Display doesn't come on but the fan turns on. It kinda looks like the fails we see with the A1398 boards that have the separate GPU where the GPUvcore chip U8900 goes bad, except this model doesn't have this or does it something similar to it?

yep. by morning the battery is fully drained from 50% charge as well.

Replaced all F6808 with F6708, still having the same issue.

Pulsing still present with Q8150 and U8130 removed. Also confirmed no corrosion under U1950.

No.

Have this board that wasn't powered up and had corrosion. Cleaned up the corrosion and replaced damaged R8156. PP5V_SR4RS3 pulses, so does ALL_SYS_PWRGD, PPVCC_S0_CPU, PLT_RESET_L and all the big coils. SPI Bus Termination resistors good I removed J6100 and also flashed know good BIOS with...

Anyone happen to know if there’s a tool for performing data recovery from 2012 MacBook 12” that has a dead logic board?

Not much history just that it stopped working. No corrosion or sign of liquid spill or damage. There was a short on PPBUS_G3H_CPU which was resolved by replacing Q7900.

L7690 - yes @ 3.3v PM_DSW_PWRGD - 3.4

These are all the PCH RTC signals PCH_INTRUDER_L - 2.8 PCH_SRTCRST_L - 3.08 RTC_RESET_L - 3.08 PP3V3_SUS_PCH_VCCRTCPRIM - 3.3

Yes to PP3V1_RTC @ 3.1v and i'm only seeing one PCH's RTC signal, PPDCPRTC_PCH @ 1.66. Every other PCH RTC signals are omitted in the schematic and board.

Originally PP20V was present but no PPBUS_G3H_CPU. Replaced Q7900 which restored PPBUS_G3H_CPU, but the board still isn't powering up. Missing PP5V_S4 due to P5VS4_EN being at 0v. PM_SLP_S5_L is also at 0v. Other voltages i noticed was PM_EN_P3V3S4 which is reading 0.024, PMIC_EN_P3V3S5 is...

crap. ok, guess i'll be waiting on the FDMF6708 then. thanks.

I actually have 3 F6808N from a couple years back when I ordered a bunch of them.

So online it says to replace the FDMF6808 with FDMF6708, unfortunately i can't find any locally, will just replacing Phase 1 with a new FDMF6808 suffice for now. Also should i replace all 3 phases

Ok. Will replace that. Also, this morning i checked on it and the cpu is now warm with current across R7150 now at 1.534A and the battery now at 27%. I'll let you know how it goes after FDMF6808 replacement.

Also, after about a 3 plus hours the battery only dropped about 2%. Plus this time around the board wasn't warm, but it did have the symptoms mentioned above with only the fan running, requiring me to reboot the system. Current across R7150 is 49mA. This after the system has been in sleep for...

One other thing, if there's still life in the battery, and i allow the computer to sleep for a few hours, when i wake it up, the board comes on with the fan spinning and it starts to ramp up until full spin, the display however never comes up. Going to get you the above reading shortly.