820-01521 a1932 no power got 20v 1.47amp

[Jeffotskie26]

macbook a1932 with water damage
20v with 1.47amp stuck from here.
PPBUS_G3H is 1.5v with diode to ground 0.468
PPDCIN_G3H 0v with diode to ground 0.565
theres no short circuit from the big coils.
what should i check next?

 

[2informaticos]

Did you note liquid sign on the audio board?
Check both sides.
Also look at audio flex and connectors.

Do you get R7020 voltage?

 

[Jeffotskie26]

audio board is corroded too
j6100 connector and audio flex not so bad (looks still ok)
btw i test the board itself without any ribbon connected (removed motherboard from the case)

anyway after i put the board to ultrasonic machine on more time
now the usb meter is 5.19v 1.47amp stuck here.

PPBUS_G3H 2.1v
PPDCIN_G3H|PPDCIN_G3H_CHGR 5.1v
PP3V3_G3H 0v 0.400 (diode to ground)

u3100
PP1V8_UPC_XA_LDOA/D 1.8v
PP3V3_UPC_XA_LDO 3.3v
PP1V1_UPC_XA_LDO_BMC 0v 0.489

u3200
PP1V1_UPC_XB_LDO_BMC 0v 0.497
PP1V8_UPC_XB_LDOA/D 1.8v
PP3V3_UPC_XB_LDO 3.82v

 

[2informaticos]

PPBUS_G3H should appear with just 5V at R7020.
Post diode mode reading at F7000.

Corrosion on the audio board probably damaged T2.

 

[Jeffotskie26]

F7000 0.001 |1.564 diode to ground |0.1V

 

[2informaticos]

Just for note; check diode mode with red probe at ground in the future.

Do you get R7020 voltage?

 

[Jeffotskie26]

PPVBAT_G3H_FUSE why im having 1.541 ohms? red prove to ground diode mode ofcourse
i replaced already u7000/q7065
r7063 is correct with 1k value
with diode mode red prove to ground pin1 is 1.541 PPVBAT_G3H_FUSE | pin2 0.616 CHGR_VBAT

r7020 voltage:
PPDCIN_G3H|CHGR 5.1v

 

[2informaticos]

Post U7000 basic voltages; P_IN, AUX_DET, VDDA/P, AUX_OK, EN_MVR, A/BMON.

 

[Jeffotskie26]

P_IN 5.1v
AUX_DET 1.2v
VDDA 5.0v
VDDP 4.9v
AUX_OK no idea how read voltage for this.
EN_MVR 0v
AMON 0V
BMON 0V

 

[2informaticos]

Sorry, AUX_OK is not used here.

Looks to have U7000 issue; try another one.

 

[2informaticos]

ooops, I just realized U7000 is not on PPBUS_G3H circuit.
Do not touch U7000 yet.
Check R7060 voltage, if exist.

 

[Jeffotskie26]

r7060 PPBUS_G3H | PPVBAT_G3H_CHGR_R 5.3v

 

[2informaticos]

Strange to get 5V there.
Check Q7030/40 for internal short.

 

[Jeffotskie26]

after i removed and clean Q7030/40 now got 20v 1.47amp stable on usb meter
r7060 PPBUS_G3H | PPVBAT_G3H_CHGR_R 12.6v stable
F7000 12.6v looping to 0.2v

 

[2informaticos]

F7000 is just for battery, as already said.
No reason to check there, unless battery is connected.

Try to put the machine in DFU now.