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A1989 - 820-00850-A NOT BOOTING NO USB ACTIVITY

M

manumathew.017

Member
The customer said he kept it a long time, but suddenly one day doesn't work ... No water shades ,,,,

I can see the fan is running,
tried to revive but no USB activity was detected. Not booting , Not going to recovery mode....
Here are some voltages after detaching the board

CHGR_LX1 -12.64
P5VUSBC_X_R - 0V
PPVIN_SW_LCDBKLT_SW - 0V
PP3V3_G3H - 3.336V
PP5V_G3S -5.141V
PPVCCEDRAM_S0_REG_R-0V
PPVCCGT_CPU_PH1 - 0V
PPVCCGT_CPU_PH2 - 0V
PPVCCGT_CPU_PH3 - 0V
PPVCC_CPU_PH1- 0V
PPVCC_CPU_PH2 - 0V

PPVCCSA_CPU_R - 1.050V
PP0V95_S0_CPUVCCIO_REG_R - 0.960V
PP1V2_S3_REG_R - 0.03V
P5VUSBC_T_R - 0V
 
2informaticos

2informaticos

Administrator
Staff member
You board gets lot of basic voltages, but CPU core is missing.
In such case, machine should be able to enter DFU mode.
Try to force it using external switch method.

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area
logi.wiki
 
M

manumathew.017

Member
The System cannot be restored on this device.


Unexpected device state 'BootedOS' expected 'DU' (Probably caused by a transient USB layer issue causing missing or duplicate events)


[com.apple.MobileDevice.MobileRestore


- OxFBO (4016)]



I’m getting this error between revive process
 
M

manumathew.017

Member
The battery and trackpad are not connected ,,,,,. I tried to restore it but got the same error...

should I try the same by connecting the battery and trackpad?
 
M

manumathew.017

Member
1724672812856.jpeg

RE032 3rd pin pad came out,,,, so i think 4th pin also no more opeartional ,,,,, i am using the via near U3100 ,,, but not able to get into dfu mode...


before this happening i was tried with trackpad.... i didnt get a message saying the revive is success.... also tried restore .... there i got a different error ...cant recollect it anymore
 
M

manumathew.017

Member
Tried different laptop , with Monterey, Apple Configurator beta version download from internet ,,, now I get different error
 

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M

manumathew.017

Member
While reviving

The OS cannot be restored on this device.


The operation couldn't be completed.


(AMRestoreErrorDomain error -1 - Failed to handle message type StatusMsg (Generic error)) [AMRestoreErrorDomain


- OxFFFFFFFFFFFFFFFF (-1) [sys = 0x3F,


sub = OxFFF, code = 0x3FFF (16383)]]



While restoring ,
Stuck at this window
 

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M

manumathew.017

Member
I have shorted the 3V3_S5 , now L7030 is measured 4.5V ,
Restoring is still failing with the same error

The System cannot be restored on this device.


Unexpected device state 'BootedOS' expected 'DU' (Probably caused by a transient USB layer issue causing missing or duplicate events)


[com.apple.MobileDevice.MobileRestore


- OxFBO (4016)]
 
M

manumathew.017

Member
I’m using Mac OS Ventura for Apple Configurator, configurator was not available directly in App Store,Downloaded it from a third party website….Does it has anything to do with the restore failure?
 
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