MBA A1932 820-01521-A no Post after few seconds it restarts

[PACh]

Hi, I need help fixing this. Any help will be highly appreciated.

Got a macbook air A1932 820-01521-A with the trackpad click not working, the fuse was blown (its never the fuse) I tested the line and seems ok, replaced the fuse and it worked again... all good BUT when I tried to remove the board again I pressed the reset switch (SW6955) next to the battery connector WITH the USB-C power still connected to the board.... I pressed and kept pressed for some seconds twice because the fan started to spin... then I realized why.... 😕

After that the machine wont boot, It gets 20V and start booting it goes briefly until 0.57A the returns to 0.45-0.49A and stays there, after some seconds it restarts the boot process again (watch the video), I dont get anything on the screen. the CPU start to get hot and fan starts spining, I guess it reboots because CPU gets too hot.

The switch SW6955 still gets 3.3V
All the SLPS2R are with the correct voltage.
PVDDCPUAWAKE_SW0 to _SW3 when booting 0.97V then goes to 0.55V and stays there.

PP1v2_S0SW: 1.19V
PP1v_S0SW: 1V
PPVCCIO_S0_CPU: 0.95V
PPVCCSA_S0_CPU: 1.1V
PPVCORE_S0_CPU: 0.84V
PPVCCGT_S0_CPU: 0V
ALL_SYSPWRGD: 1.8V

L7210: 0.844V
L7230: 0.844V
L7230: 6.5 Ohms
L7210: 6.5 Ohms
L7430: 5 Ohms
L7410: 5 Ohms
L8102: 52.4 Ohms
L7030 is 1.9Mohm

Trackpad click still works, no green light on shift key, if I connect an usb to the usbc it gets light but not like it is reading it.

Watch the video

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

*imnub* is the keyboard ok? is the close panel switch engage?

[PACh]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

*imnub* is the keyboard ok? Is the close panel switch engage?

Keyboard works, i can get into DFU (tried to restore but didnt work)
What do you mean by „close panel switch“?

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

if lid not fully closed+bad kb =/

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

explenation : a clietn wit non working kb return me a fully working battery and macbook to me , i told him that if he wanted to boot the laptop he had to plug in the charger n thats it , then next day he says hey its not working my mb is dead ... he bring it i flip the mb unplug the battery and tell myself its a SMC fault.,..
but nah , it was faulty close lid switch

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

happends only wit dead kb + bad lid sensor lol

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

sudo nvram autoboot=%03


thats auto power on wit charger or lid up

sudo nvram autoboot=%00

thats only power button
in terminal while into a session for sure hehe

[PACh]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

explenation : a clietn wit non working kb return me a fully working battery and macbook to me , i told him that if he wanted to boot the laptop he had to plug in the charger n thats it , then next day he says hey its not working my mb is dead ... he bring it i flip the mb unplug the battery and tell myself its a SMC fault.,..
but nah , it was faulty close lid switch

The logicboard behaves the same when I take it out with nothing but the usb-c connector. The booting amperage changes are the same and the cpu gets hot.

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

bad battery +charger might be ur answer lol

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

if a macbook pro a1398 dont have a good battery it goes into boot loop

[PACh]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

bad battery +charger might be ur answer lol

Tested with new battery and different working chargers…

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

Tested with new battery and different working chargers…

smc chip chek wit thermal cam for faulty chip

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

if u dont have drop some alchool n watch for fast drying area

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

if none micro circuit get hot except cpu , chek for screen defect if not ... core n ram defect ? thats what i know so far and i rmbr ya that im nub lol

[PACh]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

if u dont have drop some alchool n watch for fast drying area

Macbooks with T2 chip doesnt have SMC

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

i bought a flir c3 at a pawnshop 2 week ago and its alrdy not powering up XD plz god help me

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

58-95

https://imgur.com/a/NVC9Kde

https://imgur.com/a/bmrIjk7
38-95

[mon2]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

On the A1932, post the voltage readings of:

SMBUS_3V3_BATT_SCL
SMBUS_3V3_BATT_SDA

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

would love to , dont have acess to machine =( ( btw hows is the lion head ? hehe )

[HelpMeRepair]

Re: MBA A1932 820-01521-A no Post after few seconds it restarts

Macbooks with T2 chip doesnt have SMC