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I have no other machine at the moment. I am just going to try using your previous suggestion of a 'clean ME' but I didnt know how. I've viewed Piernov's youtube [which I find quite unclear. e.g. at 6min33 why open flash image tool to then drop a file in it and then exit without saving???] but...

Is there any way to determine any life in the cpu? Should I see 1.35volts on the output of these FETs at least? After all before I replaced the fets I was seeing 6.66volts on their supply (PP5V_S0) but now the board appears to be in an S5 state! Could you explain a little about whether the cpu...

Customer brought in a dead A1398 with no visible corrosion. Inspected it and found one FDMF6808N with a crater - see photo. Replaced it with FDMF6708 but the other two FET were getting hot as well so replaced all three. Noticed prior to changing them that their power rail PP5V_S0 was at 6.6v...

SSD inserted pp3vs_ssd_flt 3.3v ppbus_ssd_flt 13.06v ssd_en 3.3v ssd_clkreq_l 3.3v ssd_reset_l 3.3v

CD3215 XB = U3200 CD3215 XA = U3100 CD3215 TA = UB300 CD3215 TA = UB400 Voltage (when relevant port powered) Diode Mode PP3V3_UPC_XB_LDO 3.2 0.42 PP1V8_UPC_XB_LDOA 1.8 0.477 PP1V8_UPC_XB_LDOD 1.8 0.443 PP1V1_UPC_XB_LDO_BMC 0v 0.443 PP3V3_UPC_XA_LDO 3.3 0.465 PP1V8_UPC_XA_LDOA...

DFU would not work as displayed above. As a recap the board is stuck at 5volts, 3 USB ports draw around 50mA and one draws zero. The one drawing zero is the top left (XB) when sat at laptop. Out of interest when I put an oscilloscope on the clock signal of the flash memory I can see the burst...

Ive tried both revive and restore and both timeout with message "The system cannot be restored on this device. Gave up waiting for device to transition from DFU state to DFU state.com.apple.MobileDevice.MobileRestore - 0xFA5 (4005) Pardon my use of phone to snap screen image I have the board...

Im trying DFU and I see 'DFU' on host Mac [even without jumping swk003] but when I click update I get message "Configurator could not perform the requested action. Apple Controller devices do not support this action"

I think that is true to say.

Thanks for clearing that up. Could I get some guidance on finding the problem with the board. I have a new battery for it so should be able to rule the battery out.

ppbus_g3h 12.3v ( I noticed that if I have battery connected charger does switch to 20v but zero current flows. Another board I have only boots with battery connected otherwise the charger sits at 5volts. So should these boards be debugged with battery connected to allow charger to get to 20v? )

Ive got a good alternate internal SSD now but it makes no difference. Lost

No luck with NVMe M2 card and converter - not recognised

I don't have one - I knew I should have got one of these for debug. I have a converter to a NVMe M2 card so I will try an install on that.

After removing SSD it was able to boot from a macOS installer USB but with no drive installed nowhere to install to. I put SSD drive back and held Option but I don't get any video output on either internal or external.

I do get external video via USB C but only the Apple logo and a gradually extending time bar that reaches 100% and stops with no further change even after 8 hours. Re fault history: Customer says he gets black screen mostly but very occasional login screen - not sure if he is referring to start...

Customer reported no display but very occasionally a login screen. No visible corrosion. Fan spins Caps key toggles string of usb flashes (snow edition stick) ppbus_g3h 13.06v pp3v3_g3h 3.4v pp5v_s5 5.1v pp3v3_s 3.1v allsys_pwrgd 3.2v L7210pin2 0.96v then 0.67v cpu core voltage New screen...

Sadly I wont even get a donor board out of it. Did you put down the 0.45 amps to 0.7 amps as not worth investigating - is it normal or something trying to switch on but switching off?

6 days later. I was hoping for an opinion whether there was any future hope for this board. Customer has become disillusioned and wants the macbook returned.

Student client cant pay for data recovery so fixing the board is the only way. Is there any further hope for the logic board? (other than a much needed donor ;) Should the cause of the periodic increase in current draw be looked for or is it normal behaviour? Some further advice appreciated!