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A2289 - 820-01987 5V

M

mushr00m

Member
I do have a MBP A2289 (820-01987) which is not turning ON has around 5.15v on the USB-C connectorI

tried DFU to see if have any behavior on Apple Configurator. Nothing happened

PPBUS_G3H = 12.23 and drops to 8 in a constant loop
3V3_G3H_RTC = Goes to 1.7v and drops in a constant loop
 
M

mushr00m

Member
Actually it goes to 12.23 stay for 2 seconds... drops to 8V stay for around 2 seconds too and the LOOP never ends
 
M

mushr00m

Member
Do I need battery connected to check if C7050 is stable since it's PPVBAT line?

I am working with the bare board on the bench by the way and the USB-C connector to power the board.
 
2informaticos

2informaticos

Administrator
Staff member
So you have a problem with a secondary power rail.
Check diode mode on all big coils; compare with good board.
Don't forget L9080.
Also check all the coils surrounding U7800.
 
M

mushr00m

Member
L7030 = 0.490 = CHGR_LX1 = OK
L7702 = 0.043 = PVCCEDRAM_PHASE = OK
L7420 = 0.003 = CPUGT_SW2 = OK
L7410 = 0.003 = CPUGT_SW1 = OK
L7220 = 0.003 = PPVCC_CPU_PH2 = OK
L8100 = 0.200 = P1V2_PHASE = OK
L8410 = 0.815 = PPVIN_SW_LCDBKLT_SW = OK
L9080 = 0.391 = PPVCC_SW1_TPS62180 = OK
L9081 = 0.391 = PPVCC_SW2_TPS62180 = OK

Put some the coil name, measurements, line name, and that I think all of them are ok.

Is there more coils that I didnt measure and should take a look?

Also not sure how to remove the shield around U7800.
 
2informaticos

2informaticos

Administrator
Staff member
There should be some capacitors on the opposite side of U7800; connected to the coils too.

You should also check the outputs from "Power FETs" page.

BTW, any reason to check TWO coils which are tied together?
Is not big time saver, just a nonsense...
 
M

mushr00m

Member
The coils around U7800 as below

L7824 = 0339 = PVCCQSSD_SW0 = OK
L7823 = 0.330 = P0V9SSD_SW0 = OK
L7821 = 0.137 = P1VPRIM_SW0 = OK
L7820 = 0.248 = PVPCORES5_SW1 = OK
L7813 = 0.180 = PP1V8_SLPS2R = A BIT LOW 0.351 OPENDATA
L7817 = 0.050 = PP0V9_SLPDDR = OK
L7814 = 0.257 = PP1C1_SLPS2R = OK
L7806 = 0.012 = PPVDDCPU_AWAKE = OK
L7811 = 0.032 = PP0V82_SLPDDR = OK
L7810 = 0.299 = PPVDDCPUSRAM_AWAKE = OK

To measure output from Power FET. Do I need to put back F7000 which you told me to remove and for sure measure voltage right?

Sorry about measuring coils that are tied together... still improving my measurements skills!
 
M

mushr00m

Member
PP3V3_G3H_RTC = 0.002 = WEIRD
PP3V3_G3S = 0.002 = WEIRD
PP1V8_SLPS2R = 0.180 = A BIT LOW
PP3V3_S4SW_SNS = 0.525 = OK
PP5V_S4SW = OL = OK

Those are the measurements.

Let me know if you need anything else more from the Power FET page
 
2informaticos

2informaticos

Administrator
Staff member
Shorted 3V3_G3S/G3H_RTC?
Should fix these problems.
Voltage injection method should help you.

First, check for short S-D at U8200.
 
M

mushr00m

Member
It looks like shorted 3V3_G3S/G3H_RTC.

Not sure what you mean by S-D.

However all pins are 0.002 on U8200 except PIN 2 (P3V3G3S_EN) = 0.548
 
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