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

[zmeutz]

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 ?

at the begining all measurements drive me to the same direction and I start to reball SMC, first of all, because I didn't find water damage / no liquid ... after SMC reball no change, same voltages ...

I clean SMC now, it was dirty

[dellxps15]

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

ok for that. measure all coil after inserting psu only ( no battery) check if some s4 s3 s0 volts comes.

volts on L5001 ?

[zmeutz]

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

L5001 3,44v

no voltage on coils ...
s5 has 0,54v

[zmeutz]

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.

I notice that, do you know from where start
PPBUS_G3H and PPBUS_G3H_R

I see also D7005 pin 1 with 1.75v = PPBUS_G3H_R
pin 2 and 3 15v

I don't find any short ... u7501 is responsable to make 8v voltage?

[dellxps15]

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

on the other page u write:
D7005 pin 2 and 3 15v and pin 1 8v
R7006 8v both sides
R7005 15v both sides

8.5 volts are made by u7100.
edit: remove f7140 and measure voltage on f7140 pads.

[mon2]

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

as per @dellxps15's comments

PPBUS_G3H is made by U7100 - sheet 50/76 pdf schematics.

F7140, pin # 1. 8.22v

But pin 2 of F7140 is not 8v22 ??

Then F7140 is blown / tripped. If yes, why did this happen ?

Remove all power, meter in resistance (ohms) mode, black lead on ground & red lead on F7140, pin 2.

What is the reading in ohms ? If the reading is too low in ohms then you most likely have a bad / shorted cap (assuming there is no soldering or damaged part from liquid) issue.

[zmeutz]

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

I replaced C7102 = PP3V42_G3H and U7100 ... now I have right voltage ...
F 7140 8.6v
L7130 pin 2 8.6v pin 1 7.4v
L7560 3.3v both pins
L7520 still 0v

PPBUS_G3H 8.6v
PPBUS_S5_HS_COMPUTING_ISNS 8.6v
PPBUS_S5_HS_OTHER_ISNS 8.6v
PPDCIN_G3H_ISOL 15v
PPDCIN_G3H 15v
PP3V42_G3H 3.45v
PPVRTC_G3H 3.34v
PP5V_S5 5v
PP3V3_S5 3.34v
PP3V3_SUS 3.34v

PP5V_S4RS3 0v
PP5V_S0 0v
PP3V3_S4 0v
PP3V3_S3 0v
PP3V3_S0 0v
PP3V3_S4SW_SNS 0v
PP3V3_S0SW_SSD 0v
PP3V3_S4_TBTAPWR 0v
PP1V8_S3 0v
PPHV_S0SW_LCDBKLT 0v

L.E.

found topic same as mine ... from now
https://www.badcaps.net/forum/showth...t=69953&page=2

same rails with 0v and the other one have same with his ...

[zmeutz]

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

found short on U3510 ...
removed, and now I have voltage on most rails ...

USB3740, it's usb ic or bluetooth?

[mon2]

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

Very nice!

https://www.microchip.com/wwwproducts/en/USB3740

It is a USB signal switch so that a single port can mate with 2 different USB devices. Like a DPDT switch.

[mgjini]

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

L5001 3,44v

no voltage on coils ...
s5 has 0,54v

hi there i don't know if i am allowed to post on the same thread or not, i have same issue, the reason why i am quoting here is that i have measured all pp3v42_g3h and every where i do get 3.42v but l5001 pin 1 there is 0v

i am trying to understand is this smc issue, i have the exact same board

regards

[mon2]

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

pp3v42_g3h and every where i do get 3.42v but l5001 pin 1 there is 0v

That is a very good observation !

Indeed there should be 3v42 present on pin #1 of L5001.

Remove all power / no battery.

Meter in resistance mode (2k scale is ok). Use the meter to check for continuity between a known good PP3V42_G3H point and pin # 1 of L5001.

You should see ~0 ohms between the 2 test points. If you see OL = over limit then there is most likely a damaged via or trace so the voltage is not reaching L5001.

After this confirmation, consider to take a piece of wire from a known good source for the PP3V42_G3H rail and solder it onto the pin #1 of L5001 to make up for the broken connection.

Confirm the continuity with the meter and then proceed to test again with your power adapter.

Post your results.

[mgjini]

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

That is a very good observation !

Indeed there should be 3v42 present on pin #1 of L5001.

Remove all power / no battery.

Meter in resistance mode (2k scale is ok). Use the meter to check for continuity between a known good PP3V42_G3H point and pin # 1 of L5001.

You should see ~0 ohms between the 2 test points. If you see OL = over limit then there is most likely a damaged via or trace so the voltage is not reaching L5001.

After this confirmation, consider to take a piece of wire from a known good source for the PP3V42_G3H rail and solder it onto the pin #1 of L5001 to make up for the broken connection.

Confirm the continuity with the meter and then proceed to test again with your power adapter.

Post your results.

so i measured in quit a few places with a good pp3v42 and i am getting red probe pin 1 l5001 3.50 kΩ

do i still proceed with the wire?

also to add board draws 20v 3 amp

[mon2]

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

Are you using the original power adapter ? 20V ??

[mgjini]

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

Are you using the original power adapter ? 20V ??

hi yes i am and also i have power supplier

[mgjini]

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

the only thing on thermal camera which shows is u7100 but i have changed this with a new one, i have about 10 spare new ones

i don't understand 2 boards with same thing showing on thermal camera both faulty

[mon2]

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

The use of an original magsafe power supply is recommended as it does a soft start and is safer to use than a power supply with the magsafe head.

If you are confident there no heated parts then it should be fine to consider the missing wire. You do not have a short @ L5100 with such a high resistance to ground. L5001 should have the PP3V42_G3H voltage on pin #1 so suspecting a blown via from one side of the board to the other or damaged trace due to liquid damage.

After applying the missing wire / connection -> check with the meter in resistance mode to confirm the connection is good and is also the same ~0 ohms on L5001, pad # 2. This rail powers the SMC (U5000) which is very critical.

[mgjini]

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

The use of an original magsafe power supply is recommended as it does a soft start and is safer to use than a power supply with the magsafe head.

If you are confident there no heated parts then it should be fine to consider the missing wire. You do not have a short @ L5100 with such a high resistance to ground. L5001 should have the PP3V42_G3H voltage on pin #1 so suspecting a blown via from one side of the board to the other or damaged trace due to liquid damage.

After applying the missing wire / connection -> check with the meter in resistance mode to confirm the connection is good and is also the same ~0 ohms on L5001, pad # 2. This rail powers the SMC (U5000) which is very critical.

i connected wire to l5100 and then to pp3v42 and now no light on charger and nothing happening still sorry for delay reply just double checking, i tried both power supply and charger, removing the wire charger light back on

[mon2]

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

Review these very good articles on the A1466:

https://repair.wiki/w/A1466_2013-201...9D_MacBook_Air

https://www.it-tech.com.au/mac-q-a/m...-up-sequences/

https://logi.wiki/index.php/Power_Rail_List

[mgjini]

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

Review these very good articles on the A1466:

https://repair.wiki/w/A1466_2013-201...9D_MacBook_Air

https://www.it-tech.com.au/mac-q-a/m...-up-sequences/

https://logi.wiki/index.php/Power_Rail_List

hi yes i will have a read thanks

[mon2]

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

What is the voltage value for your PPBUS_G3H ?