MacBook Pro A2442 820-02098 flashing capslock

[Mortentoft]

Hi’.
Sorry if it is a stupid question. I have for the first time a A2442 mbp 2021 14” “suddenly stopped working” Said the costumer … i have found a harmless tiny liquid point on the LB. It takes 5v with low amperage (0.050 ish). what ever I connect (MagSafe 3 og usbc) the capslock flashes (1-2 times a second).
Does the flashing lock tell anything? I know I am ready to messure - I will. But has anybody seen a flashing capslock?
thank you

 

[2informaticos]

I didn't face same problem.
Check for corrosion, test the board alone on the desk.

 

[Mortentoft]

Hi’ 2Informaticos.
Finally I had the time to pull out the LB. These A2442 are all new for me, so Sorry if I am a moron. Board alone takes 5 v and pull slow 0.030 up to 0.700 and galla down to 0.060 and again up to 0.6/700 amp. Sound like a short somewhere. But not obviously blown/damage anywhere. Do you have any idea?

 

[2informaticos]

Need to connect both charger and battery.
Not sure it this board starts correctly with charger alone.

Check if get steady voltage on the big coils.

 

[Mortentoft]

Hi’ again 2informaticos. LF800 is pulsing from 0.000 volt to 1.780 volt. Seems it has trouble firering up somehow. I do not have schematics but boardview so I’m a bit lost.

 

[2informaticos]

A2442 - 820-02098 - M1 Pro.rar

drive.google.com

Do you get stable PPBUS_AON and 3V8_AON?

 

[Mortentoft]

Do you get stable PPBUS_AON stable 12,37 volt
and 3V8_AON? Hmmm… Pp3v8aon_ph1 unstable… 0.000 to 0.158
Same for PP3v8_AON on DV019 area
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[2informaticos]

Check diode mode to ground on other big coils and secondary power rails.
Compare with good board.

 

[Mortentoft]

I will search and Thank you for the link. I will sent you the new information as soon I find news. Do your experience exclude the CD3217?