macbook pro 820-02100 5v 0 amp

[MalodicOne]

Unit came to me and customer said they spilled liquid on it. Opened unit and inspected board and saw no signs on liquid reaching the board. Plugged in amp meter and it pulled 20v and booted normally, i connected to internet and ran update on the OS. Came in the next day to test again to make sure unit was functional, now its stuck at 5v and 0 amps no power, no shorts found on so far.

Tested all CD3217 and RAA489900:
UF400
PP3v3_UPC0_LDO- 3.48v, .473 Diode
PP1v5_UPC0_LDO_CORE- 1.59v, .504 Diode
USBC0_CC1- 0v, .455 Diode
USBC0_CC2- 1.66v, .454 Diode

UF500
PP3v3_UPC0_LDO- 3.43v, .474 Diode
PP1v5_UPC0_LDO_CORE- 1.58v, .507 Diode
USBC0_CC1- 0v, .451 Diode
USBC0_CC2- 1.64v, .451 Diode

UG400
PP3v3_UPC0_LDO- 3.47v, .470 Diode
PP1v5_UPC0_LDO_CORE- 1.59v, .506 Diode
USBC0_CC1- 0v, .454 Diode
USBC0_CC2- 1.66v, .454 Diode

U5200
P_IN- 5.18v
AUX_DET- .85v
AMON- 0.0v
BMON-0.0v
AUX_OK= 1.76v
SMC_RST- 0.0v
BGATE- 12.34v

All of these look normal to me and im not sure where to go next? MPMU?

[mon2]

What is the voltage to ground of the following?

PP1V8_S2_CHGR
PPCHGR_VDDA
PPCHGR_VDDP

[MalodicOne]

PP1V8_S2_CHGR- 0.0v
PPCHGR_VDDA- 4.5v
PPCHGR_VDDP- 4.5v

[mon2]

Remove all power. Meter in resistance mode.

Measure the resistance to ground of PP1V8_S2_CHGR.

[MalodicOne]

PP1V8_S2_CHGR- (20k) 4.3, Red on ground

Is S2 voltages supposed to be present when just plugged in?

[mon2]

No. Just checking if there is a local shorted cap on this rail - had one in the shop where the local 1uf was shorted.

Check your battery of your meter. The measurements are off.

3v3 is being measured as 3v48

Concerned about 4v5 which should be 5v.

[mon2]

Remove all power -> meter in resistance mode. Measure the resistance across C5220. Checking the full path resistance of the input to the regulator @ U5200. What is the resistance in ohms?

[MalodicOne]

I just changed the battery in the meter about a week ago.

C5220 (200) 3.0

[mon2]

Touch your meter probes together. What is the resistance?

CHGR_AUX_DET = AUX_DET is low @ 0v85

What is the resistance to ground of PPDCIN_AON_CHGR?

[MalodicOne]

On 200 its .4

on the RAA489900, are the A4 and A6 versions of this chip compatible?

[MalodicOne]

PPDCIN_AON_CHGR- (200K) 71.9, this number started lower and kept moving up to this reading until it stopped.

[mon2]

Not sure on the compatibility list.

What is the voltage to ground of PPDCIN_USBC_AON? This should be @ 5v. Same voltage should be present on each side of C5220. Confirm it.

[MalodicOne]

PPDCIN_AON- 5.20v on all 3 usbc
c5220- 5.18v on both sides

[mon2]

What is the exact voltage to ground of PPBUS_AON_REG @ F5200?

[MalodicOne]

PPBUS_AON_REG @ F5200- 12.35v

[MalodicOne]

After i apply power to the board and take that reading, i removed power and checked diode mode on the large tantalum caps for this line and the meter started negative with a beep and rose from negative value to positive value .445, also when i do ohms scale at 20k the value goes from ~8 to 12.2. Is this normal or the caps just filling up with charge?

[mon2]

Remove all power. Measure the resistance across R8101.

Measure the resistance to ground of:

SMBUS_BATT_SCL
SMBUS_BATT_SDA

[mon2]

Is this normal or the caps just filling up with charge?

I believe that you still have residue charge on the board. Suggest to allow ample time between these tests to truly discharge all energy from the board. Then proceed to test resistance or diode mode.

[MalodicOne]

resistance across R8101- 197.3 @ 200k
SMBUS_BATT_SCL- 8.31 @20k
SMBUS_BATT_SDA- 8.28 @ 20k

[mon2]

Looks ok. Try a DFU.