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820-01700 20volts 0.0amps

Outofwhack

Outofwhack

Member
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 (battery and charger connected).
pp1v8_slps2r 1.8v
pp1v8_s5 0v
pp3v3_s5 0v

I also have a working board.
Any clues?
 
2informaticos

2informaticos

Administrator
Staff member
If you can complete DFU revive, then data can be retrived in DFU mode; by an Apple authorized service.
Is even possible to start working normally, after revive; data is preserved.
 
Outofwhack

Outofwhack

Member
Revive ended with "system cannot be restored on this device" code 1
I did get apple logo and time bar appear on screen.
AC2 now showing Apple Controller square.

So is the pp1v2_s3 0v controlled by the system and nothing can be done if a revive does not complete? Ive never seen any process under AC2 complete ever! Can you please confirm it does, sometimes..
 
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2informaticos

2informaticos

Administrator
Staff member
1V2_S3 is RAM power rail.
Must be good; if you got image; even for short time.

Did you try starting in safe mode?
Also check target disk mode.
 
Outofwhack

Outofwhack

Member
No response as I try safe mode.
No response as I try target mode.

Wonder if restore might make it good but customer only interested in his data.
= no profit on no fix no fee basis sadly.
 
Outofwhack

Outofwhack

Member
Tried DFU revive with trackpad, battery and touchid connected. Still seeing apple logo and progress bar.
But I am getting another error message and didn't spot when it changed from 1.

AMRestoreErrorDomain 1101
Failed to handle message type
ASR invertor error

I'm seeing heat of 70c on the heatsink. Why would it be generating this amount of heat when attempting a revive?
Admittedly I haven't had fans connected [and since the fans were 100% clogged I suspect the owner had it getting this hot too].
I have recently spotted a cracked capacitor CA883 although it had not failed shorted.

Is there a set of keystrokes to get out of DFU mode??
 
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