820-00923-a not turning on.

[BCN_Techs]

Board with water damage.

There was a short on PPBUS.

Changed U7900 and U800 ( were bad)


Now getting:

PPBUS, 3V3_S5/SUS. Checked big coils and no pulse. On charger i get 20V and stack at 0.04 AMPS.

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.

 

[BCN_Techs]

Sorry for delay. Customer asked me to stop repairing ( financial issues ). No we retake it.


Yes when i triger SMC_ONOFF_L PM_PWRBTN_L drops from 3.3 to 0.3V

 

[2informaticos]

Check if PM_SLP_Sx_L signals pulse at same time.

 

[BCN_Techs]

PM_SLP_S5_L - missing and shorted but PM_SLP_SUS_L- 3.3V. May i inject voltage?

 

[2informaticos]

Exact ohm resistance to ground at PM_SLP_S5_L?
Allow 10-15s after power is removed...

 

[BCN_Techs]

Sorry, i was wrong. PM_SLP_S5_L is not shorted and has 100Kohms to ground. but 0V

 

[2informaticos]

"Yes when i triger SMC_ONOFF_L PM_PWRBTN_L drops from 3.3 to 0.3V"
PM_SLP_S5_L and PM_SLP_S4_L pulse at same time???

 

[BCN_Techs]

No, Both stay 0.0V. Only PM_PWRBTN_L drops down

 

[2informaticos]

Then you have a PCH issue.
Check PCH's RTC and PM_DSW_PWRGD signals.

 

[BCN_Techs]

PM_DSW_PWRGD - 3.4V

RTC of PCH u mean this?:


RTC_RESET_L - 2.7V
PCH_SRTCRST_L - 2.7V


P.S. Seems that there was overload on PPBUS_HS_CPU because all points of componentes on that line seems be a bit other color ( like burnt), but i get 13V on that line.

Also if it can help: connecting charger i get 20V and about 0.10-0.11 Amps.

 

[2informaticos]

Still missing PCH_INTRUDER_L signal.
If good, then possibly bad PCH/CPU; check if PM_BATLOW_L goes high.

 

[BCN_Techs]

PCH_INTRUDER_L - 2.5V
PM_BATLOW_L - 3.3V


P.S. Also PPVBAT_G3H_CONN is a bit burnt but i get 12.5V. May be it damaged U7000? U7000 on this models comes with firmware, right? So i cannot just take it from any board, it must be same board.

 

[2informaticos]

U7000 is good, as you get correct PPBUS_G3H.

Looks like bad PCH...

 

[BCN_Techs]

Nothing more to check than?

if not, do u knowanhthing about dara recovery machine for this models? I saw there was a device that recover data from faulty logic board

 

[2informaticos]

The boards with Lifeboat connector, offer the option to recover SSD data with special tool.
Only if there is not a problem with SSD power rails.

 

[BCN_Techs]

Could u explain me
More please? Where i can get that tool?

 

[2informaticos]

What about Google?

apple data migration tool - Buscar con Google

 

[BCN_Techs]

Ok, thanks.