MacBook Air a1466 820-00165-a doesn’t start

[zmeutz]

Hi

MacBook Air A1466 after put in sleep mode doesn't want to wake/start

Tested new battery, charger, case and charging board.. no short and no heat…
Battery charging, when is not fully charger I see orange led on charger after a while it turn to green…

No liquid found inside…

Found on J7000 pin 1 and 2 I have 15v
On pin 3 voltage missing 0.03v …

Checked all ic no short and no heat…
Tested flex and board on other computer and they work…

Anyone had this problem?

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

Could be keyboard / power on button issue.

Try to short the power ON pads on the logic board to test this idea.

See here for the location of the pads - you can use tweezers.

https://forums.macrumors.com/threads...er-on.1735518/

If this does not work, power down -> remove the keyboard and trackpad and attempt to turn on the logic board again using only the PCB pads to bypass the power switch.

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

Keyboard power button works, tested other board…

Board I have it on desk, as I know if battery it’s removed and I plug power supply it start automatically, tested on second one , that works…

J7000 has on pin 3 5v on working one… on not working I have 0v on pp5v_s4rs3 rail…
Reballed smc and isl ic…

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

1) pp5v_s4rs3 is generated by U7501.

2) power down, meter in resistance mode. Black lead on ground.

Red lead on L7520, pin 2 - what is the resistance in ohms ?

3) Meter in volts mode, black lead on ground.

Red lead on R7551 = P5VS4RS3_EN. Reading in volts ?

4) Meter in volts mode, black lead on ground.

Red lead on PP3V3_S5_REG_R, L7560 - pin 2 - reading in volts ?

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

1) pp5v_s4rs3 is generated by U7501.

2) power down, meter in resistance mode. Black lead on ground.

Red lead on L7520, pin 2 - what is the resistance in ohms ?

3) Meter in volts mode, black lead on ground.

Red lead on R7551 = P5VS4RS3_EN. Reading in volts ?

4) Meter in volts mode, black lead on ground.

Red lead on PP3V3_S5_REG_R, L7560 - pin 2 - reading in volts ?

2) I don't have a stable value, starting from 900 and it arrive at 2000 then stops…

3) it has 0.03v

4) 0.53v

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

1) Check on both sides of R7551 = P5VS4RS3_EN for the voltage.

With the low voltage for P5VS4RS3_EN, the voltage rail is DISABLED.

2) Also, the other half of the same IC is not generating the expected PP3V3_S5_REG_R.

Check if it is enabled by reading the voltage on R7552, both legs of this resistor. If it is also low, then this rail will remain disabled.

3) post the voltages for the attached locations.

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

1) Check on both sides of R7551 = P5VS4RS3_EN for the voltage.

With the low voltage for P5VS4RS3_EN, the voltage rail is DISABLED.

2) Also, the other half of the same IC is not generating the expected PP3V3_S5_REG_R.

Check if it is enabled by reading the voltage on R7552, both legs of this resistor. If it is also low, then this rail will remain disabled.

3) post the voltages for the attached locations.

1) R7551 0v both sides

2) P3V3S5_EN_R 3.42v also R7552 3.42v on both sides

3) all locations have 0v, I think rail it's disabled ...

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

Post the values for:

1) PPBUS_S5_HS_OTHER_ISNS - this input rail must match the voltage on PPBUS_G3H as it is required to feed into U7501.

2) PPBUS_G3H

3) If the INPUT @ PPBUS_S5_HS_OTHER_ISNS is ok and U7501 is being enabled (R7552 = logic high = +3v3 - or close to this value) then PP3V3_S5_REG_R should be +3v3. But it is not.

4) pin 24 = P3V3_S5_DRVH of U7501

5) pin 27 = P3V3_S5_DRVL of U7501

6) power down / remove battery - confirm the resistance to ground on L7560, pin # 2.

If

PPBUS_S5_HS_OTHER_ISNS
P3V3S5_EN_R
pin 24_U7501
pin 27_U7501

voltages are ok then issue could be a damaged mosfet @ Q7560 which is not switching or a shorted cap downstream causing an excessive current event.

A common failure is the switching IC @ U7501 = TPS51980A. Very inexpensive on Aliexpress.

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

Post the values for:

1) PPBUS_S5_HS_OTHER_ISNS - this input rail must match the voltage on PPBUS_G3H as it is required to feed into U7501.

2) PPBUS_G3H

3) If the INPUT @ PPBUS_S5_HS_OTHER_ISNS is ok and U7501 is being enabled (R7552 = logic high = +3v3 - or close to this value) then PP3V3_S5_REG_R should be +3v3. But it is not.

4) pin 24 = P3V3_S5_DRVH of U7501

5) pin 27 = P3V3_S5_DRVL of U7501

6) power down / remove battery - confirm the resistance to ground on L7560, pin # 2.

1) 1.35v without battery and 8.10v with battery

2) 1.35v without battery and 8.20v with battery

3) correct R7552 has 3.3v and PP3V3_S5_REG_R 0v

4) 0.57v

5) 0v

6) has value 481

If

PPBUS_S5_HS_OTHER_ISNS
P3V3S5_EN_R
pin 24_U7501
pin 27_U7501

voltages are ok then issue could be a damaged mosfet @ Q7560 which is not switching or a shorted cap downstream causing an excessive current event.

A common failure is the switching IC @ U7501 = TPS51980A. Very inexpensive on Aliexpress.

I have an damaged board 820-2375-A I will try to find if has something compatible with this mosfet and ic

thanks!

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

PPBUS_G3H is not high enough for this local regulator to function. This is a buck regulator so it takes a higher input voltage and lowers it to the desired voltages.

Trace PPBUS_G3H back to the source and check that power rail. This rail must be higher with the adapter installed.

[dellxps15]

Re: MacBook Air a1466 820-00165-a doesn't start

report volts on d7005, r7006 , r7005 with battery and psu connected.

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

report volts on d7005, r7006 , r7005 with battery and psu connected.

D7005 pin 2 and 3 15v and pin 1 8v
R7006 8v both sides
R7005 15v both sides

[dellxps15]

Re: MacBook Air a1466 820-00165-a doesn't start

post u7100 volts.

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

post u7100 volts.

pin 1 15v
pin 2 15v
pin 3 3.9v
pin 4 3.3v
pin 5 2.6v
pin 6 0v
pin 7 2.7v
pin 8 1.3v
pin 9 0v
pin 10 - 14 3.42v
pin 15 3.4v
pin 16 - 17 8v
pin 18 7.6v
pin 19 - 20 5v
pin 21 - 22 0v
pin 23 - 25 7.5v
pin 26-28 14.6v

[dellxps15]

Re: MacBook Air a1466 820-00165-a doesn't start

post volts for :
PPVRTC_G3H
SMC_RESET_L

however looks like smc problem.

edit: make a good picture of smc area

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

PPVRTC_G3H 3.34v
SMC_RESET_L 3.41v

[dellxps15]

Re: MacBook Air a1466 820-00165-a doesn't start

post smc area picture. looks like smc need reflow, or something near it is bad.

[mon2]

Re: MacBook Air a1466 820-00165-a doesn't start

Post voltage on F7140, pin # 1.

Post voltage on PPDCIN_G3H.

PPDCIN_G3H_INRUSH voltage (Q7180, pins 4&5) ?

[zmeutz]

Re: MacBook Air a1466 820-00165-a doesn't start

Post voltage on F7140, pin # 1.

Post voltage on PPDCIN_G3H.

PPDCIN_G3H_INRUSH voltage (Q7180, pins 4&5) ?

F7140, pin # 1. 8.22v

PPDCIN_G3H 15v

PPDCIN_G3H_INRUSH
Q7180, pins 4&5 14.48v

[dellxps15]

Re: MacBook Air a1466 820-00165-a doesn't start

ok someone already touched smc as it doesnt have glue on its sides.
try reflow or reball it.

ps: what is that mark on smc ? burn or some very small damage ?