A2289 - 820-01987

[alfredposadas09]

this unit was no power stuck at 5v .. i check PP3V3_G3H shorted line i replace q7680 and short gone.. i have 20v now and 0.1amp - 0.9amp.. what should i check next? still no chime sound no fan spin
PPBUS_G3H @ F7000 = 12.31v both pads
P3V3G3H_VSW=0.3V diode/ 3.3 volts
PV5G3S_VSW =0.3V diode/ 0 volts << suspicious missing enable signal
P5VG3S_EN @ R7613 = 0.4v diode / 0v voltage

what to do next? should i replace the U7800 or should i check the macbook in dfu mode? ( i dont have macbook with type c yet)

 

[2informaticos]

First of all, welcome to the forum!

Do you get 3V3_G3H_RTC?
What about U7800 (SYM 1 OF 4) LDOs (page 71).

 

[alfredposadas09]

PP3V3_G3H_RTC =3.3v
PP1V8_SLPS2R= 1.8v
PP1V1_SLPS2R = 1.1v

 

[alfredposadas09]

PP0V8_SLPS2R=0.79v
PP1V2_AWAKE=1.2v
PMU_LDO3_OUT_R=1.8v
PP3V3_G3H_PMU_VDDMAIN=3.3v

 

[2informaticos]

Check diode mode to ground on all big coils; don't forget L9080.
Compare with good board, or reference table.

OpenBoardData Project

 

[alfredposadas09]

PP2V5_NAND_SSD0 @ L9080= 0.387v diode
PP0V95_S0_CPUVCCIO_REG_R @ L8102= 0.0042v diode/ 90ohms << suspicious i lift coil and test pad 0.4v diode on the regulator side and 0,0042 cpu side
PP1V2_S3_REG_R@ L8102 = 0.166v diode
CHGR_LX1 @ L7030 = 0.455V diode
P3V3G3H_VSW @ L7690 = 0.384v diode
P5VG3S_VSW@ L7670 =0.387v diode
PPVIN_SW_LCDBKLT_SW @ L8410 =0.786v diode
PP3V3_G3H_RTC_REG_R @ L6900 = 0.3v diode
PPVCCEDRAM_S0_REG_R @ L7702 = 0.021v diode
PPVCCGT_CPU_PH2 @ L7420 = 0.02v diode
PPVCCGT_CPU_PH1 @ L7410 = 0.02v diode
PPVCC_CPU_PH2 @ L7220= 0.02v diode
PPVCC_CPU_PH1 @ L7210= 0.02v diode
PPVCCSA_CPU_R @L7210 = 0.07v diode

 

[2informaticos]

Stop writing "V" after diode mode readings.
You measure the voltage generated by the constant current injected by multimeter; not a real voltage from the MLB.

Is the machine recognized into DFU mode?

 

[alfredposadas09]

Stop writing "V" after diode mode readings.
You measure the voltage generated by the constant current injected by multimeter; not a real voltage from the MLB.

Is the machine recognized into DFU mode?

Am i doing it right?

 

[alfredposadas09]

Am i doing it right? , i cant download ac2 in appstore so i download in reddit,.
View attachment 61818

 

[alfredposadas09]

 

[alfredposadas09]

i download ac2 on github cause in my MacBook a1706 it doesn't support .. i think the device isn't detecting

 

[alfredposadas09]

i try 3 different type c cable

 

[2informaticos]

Try to force DFU mode with 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

Install newer macOS version; AC2 must be available on App Store.

BTW, any reason to quote an entire message visible few centimeters above?
Write directly into bottom reply box, instead of clicking Reply button.

 

[alfredposadas09]

Try to force DFU mode with 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

Install newer macOS version; AC2 must be available on App Store.

BTW, any reason to quote an entire message visible few centimeters above?
Write directly into bottom reply box, instead of clicking Reply button.

i only got a1706 macbook pro 2016.. can i use it too ac2? base on the guide i need latest version of macos to download apple configurator 2.. do you have the latest dmg for apple configurator so i can install it into my macbook

 

[alfredposadas09]

Try to force DFU mode with 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

Install newer macOS version; AC2 must be available on App Store.

BTW, any reason to quote an entire message visible few centimeters above?
Write directly into bottom reply box, instead of clicking Reply button.

my macbook doesnt support sonoma is there anyway ? before i proceed to forcing dfu mode

 

[2informaticos]

"BTW, any reason to quote an entire message visible few centimeters above?
Write directly into bottom reply box, instead of clicking Reply button."
PLEASE...

I use an A1932 with Ventura.
Probably Apple discarded AC2 download for older versions.
If you can get it from third party, should be good; if you can confirm DFU with a good target machine.

 

[alfredposadas09]

i try to force dfu mode using tactile switch.. and i even use tweezers to force it but ac2 doesnt detect it ..

 

[alfredposadas09]

I think there is a problem with my P5VG3S_VSW I don't have 5volts here and 2nd thing is the diode reading on PP0V95_S0_CPUVCCIO_REG_R is very too low

 

[2informaticos]

None of these concerns is a reason to block entering DFU.

 

[alfredposadas09]

what to do next if the laptop is not detecting in dfu mode?