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820-01949 Stuck at 5V

C

CGid

Member
Replaced U7000 from donor board.

New U7000 Voltage readings:
P_IN - 5.087V
AUX_DET - 1.263V
SMC_RST_IN - 0V
VDDA - 5.158V
VDDP - 5.158V
EN_MVR- 5.160V
AMON - 0V
BMON - 0V

Voltage Readings around U7000 now
CHGR_CSO_N - 12.28V
CHGR_CSO_P - 12.28V
CHGR_LX1 - 0.532V
CHGR_LX2 - 0.532V
CHGR_BOOT1 - 5.681V
CHGR_BOOT2 - 5.681V
PPDCIN_G3H_CHGR - 5.087V
CHGR_CSI_P - 5.087V
CHGR_CSI_N - 5.087V
CHGR_COMP - 1.542V

I do get PPVBAT_G3H_CHGR_REG - 12.28V (Measured @ C7050)
Should I look at reinstalling F7000?
 
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C

CGid

Member
Resoldered F7000 after checking PPBUS. I get boost to 20V now. Have to wait for a new keyboard and battery to arrive as the customer's was no good. Will have better update once it arrives.
 
C

CGid

Member
Would it be easier to boot it into target disk mode and extract data if data is the only goal here? I just am curious if target disk mode is less resource intensive in a way that relies on less of the board to be functional versus it fully booting into the OS.
 
2informaticos

2informaticos

Administrator
Staff member
Target disk mode requires working CPU.

If you can complete DFU revive, then data can be recovered in DFU mode; no CPU needed to work.
But this can only be done by an Apple authorized repair shop.
 
C

CGid

Member
I was able to get the machine booted several times without issue. I extracted data to a time machine backup and transferred files to a USB without issue. However, after attempting to reset the device, the system now hangs at the Apple Logo. No loading icon, nothing. Just boots up to apple logo and stays. Under thermal, only thing getting warm is the CPU.
 
C

CGid

Member
No, I attempted an 'Erase All Content & Settings" restore from system settings when it was booting fine. During the process of that it came back to the Apple Logo and then stopped doing anything beyond that.
 
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