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Fans 100% clogged Had very small amount of corrosion around R9581 but 2.5volts seen at all NAND. Corrosion removed and C9588, R9588, C9582, R9581. 2.5volt still there. ppbus_g3h 12.6v ppbus_hs_cpu 12.6v ppbus_hs_oth5v 12.6 ppvcc_s0_cpu 0v pp1v2_s3 0v pp3v3_g3h_rtc_x 3.3v all_sys_pwrgd 0v...

I tried replacing the SOC ROM from a donor and did see a different failure message. "Gave up waiting for device to transition from dfu state to dfu state." But I mostly get error 21. What does it mean when AC2 presents the image of an open Macbook ? I saw this a few times. Is this a good thing...

Im able to get the Macbook into DFU mode with the board back in the case. Unfortunately both revive and restore end up with unknown error 21. How to go from here?

No corrosion visible. Fan full speed when in case with all peripherals attached. ppbus_aon 12v pp3v8_aon 1.8v pp3v3_aon 3.3v pp5v_aon 5v pp1v8_aon 1.8v Presuming your advise might be to do a dfu restore I checked to see if I can get it into DFO mode.... With 2 microswitches wired to board to...

Yes trackpad is connected and in good shape [no corrosion]. Ordering in a new one overnight just in case. Because this customer has valuable data and doesn't want me to try a restore.. and as it seems all I am missing is pp1v8_s5 could I force this to 1.8v to get all_sys_pwrgd and hopefully get...

The previous text was extracted by Google lens. But here's a link https://photos.app.goo.gl/pgEX4L4kvMxxCQDm7

Could I have just a bit more help with it. The guide doesn't explain how to read for my code 3FFF. Ive tried with batt and without. Lone board or fully connected. Ive had this MacBook 2 months already and Im trying to get it out before Im away for a month!

The System cannot be restored on this device. The operation couldn't be completed. (AMRestoreErrorDomain error -1 - Failed to handle message type StatusMsg (Generic error)) [AMRestore ErrorDomain OxFFFFFFFFFFFFFFFF (-1) [sys = 0x3F, sub = 0xFFF, code = 0x3FFF (16383)]]

After soldering a switch as suggested I was able to get it into DFU mode at last. A revive results in the following failure in Step 4 of 4 "Installing system" The system cannot be rested to this device AMRestoreErrorDomain error -1 filed. Generic error Same result after 3 tries

Pressing power button for 5 seconds does cause AC2 to make "Recovery" disappear. But then "Recovery" reappears without doing anything.

As soon as I plug the charger in it appears in AC2 as Recovery. Ive tried shorting the SOC_FORCE_DFU to 1.8v but AC2 sees no change from Recovery. Ive held power, right shift, left control, option for 10 seconds and seen Recovery extinguish and then comes back.

Macbook dead, no visual corrosion. 20volts ppbus_g3h 13v all_sys_pwrgd 0v pp1v8_slps2r 1.8v pp3v3_s5 0.8v (25kohm to gnd) pp1v8_s5 0v (2kohm to gnd) ipd_lid_open 1.8v tried to get into dfu mode with no luck until I replaced ROM now starts up with AC2 showing RECOVERY but revive alway aborts...

Yes it was the SMC. The backlight is now behaving. Thanks for your guidance.

No backlight after disconnection of LIO cable. smc_lid is 0.5v I removed the pull up resistor R5171 and found the pin of the SMC chip for smc_lid is 18ohms to ground. 0.006v DM Im guessing this means I need to replace the SMC? Am I correct? Things are beginning to make sense as this fault was...

I did see a .5v DM measurement on the track to the cpu whilst R7704 was removed indicated an intact ESD diode and thus ok track. Ive tried a different charger and Im getting a green light now. So Im left wondering what else can cause bklt_pwm to remain at 0v.

Backlight came on bright after jumping. I replaced resistor and cap but I am unable to verify continuity of track to cpu as there is no accessible test point at cpu end. bkl_pwm remains at 0v and image very dim = same as before. I have to admit also I am currently not getting a light on the...

I have a known good screen connected to the board. On boot I am getting such a dim display I need to view it perpendicular to the screen to see the faintest image. pp5v_s0 5v pp3v3_s0 3.3v pphv_s0sw_lcdbklt is approx 16v Current sense starts around 3v and ramps down after a few seconds but...

is there anything else I can try to get it to respond?

Just tried a switch with leads - still no luck getting into DFU mode. Verified SOC_FORCE_DFU goes from low to high. Tried with battery and trackpad connected too.

Ive tried for hours to get it into DFU mode with keyboard commands both inside case and with external keyboards and with battery connected with no luck. Ive tried jumping SOC_FORCE_DFU (pin 1 R8010) line to PP1V8_SLPS2R (pin 1 C7840) with no luck