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Hi, is there a way of knowing which model of Mac an SMC belongs to, without mounting it ? I' ve a lot of LM4FS1EH and i know they belongs to AIR from 2013 (2014 ?) to 2017 or Pro retina.....

So, i pull out R6915 and measure diode mode as you told me, in both directions. At Pin1 are the same comparing with a working board in both modes (red/black to ground); at pin 2 red to ground are the same (0.370) , but black to ground no (working 1.400, faulty 0,755). So, now, how can i find the...

Yep, one of the C6905 i wrote was C6906 instead. The only thing i don't understand is why 3.4V is correct if i pull R6915. If there is a short with U6903, the voltage should be bad also without pulling out that res, no ? And, as i told you in the prevoius post, i "played" correctly with the...

Replace C6907 and R6908. Echo Shorting R6913. Echo Put 27K in place of R6912. Echo Still 2.2V....:cautious:

Yes, if i pull R6915 i have 3.4V at C6912. R6915 changed 2 times. I changed D6902, U6903, C6905, C7081, C6905, all shorted. I changed also U7000 but it was good (put in place the old one, PP3V3_GH3 still remain). I tried also to change R6915 with a wire, but nothing change, it lowers to 2.2V anyway.

I leave only one new CD315 to do this.... Diode mode on PP3V3_G3H circuit is 370, the same of a working board.

I tried to pull out all the four CD3215 but still not 3.4V on PP3V3_G3H, only 2.2V. Tried to pull also SMC, U5256 y U5165, nothing change. Tried to manually introduce 3.4V in the circuit but voltage not lower. So i think is something not related to resistance or capacitors, but i dont know where...

Yes, R6915 is 0. I was afraid exactly of this answer. But is there a way to diagnose which of the four is the fulty, or all of them ?

Hi, this board came intact but with a terrible short on PP3V3_G3H. Now i have 3.4V on pin1 of R6915 but only if i pull out, because when it is place, voltage low to 2.2V. How can i know what is pulling down the voltage ? I am afraid of the answer.....

Well i know is not a solution but that was a dead board and i already sell a new one to the owner, so.....i will use it for experiment or replacement part. Thank you as usual for your support ;)

Yes of course. But i found a solution (not definitive) : i put the U5110 without soldering pin 4 y 5. Board boot up and work perfectly but i had to change also U7501 because S5 rails didn't turn on. Now i have to solder pin 4 y 5 of U5110 to see if all will return to normality.

No problems around U5110, all voltages, less than pin 4 and 5 are good and i am doing all tries out of notebook, nothing connected......and now ?o_O

Tried with a new U5110, no luck. Green light OFF and SMC_RESET_L with 0V

ok, i'll try with the U5110 of an air 165

So, removing U5110 green light turn on, but i have no other replacement (i had changed it !) to try. Do you know if i can find the same reference in another board ?

I already done many tries i haven't told you : C5101 was good but i had already changed it R5100 is 100K pulled, 45K in place (already changed) No corrosion around U5110 R7100 already checked Impedance (diode mode) checked in all U5110 pins. All checked obviously before changing SMC P.s. no me...

Hi, i have this board with no green light. The signal SMC_RESET_L is 0V (pulling the SMC doesn't change) CHGR_CSO_R_P is 12,26V U5110 : pin 1 : 3.4V pin 3 : 3.4V pin 4 : 0,2V pin 5 : 0V pin 6 : 3.4V pin 7 : 3.4V pin 8 : 3.3V Things done : - changed U5110 - changed SMC - checked res R5100 (if i...

Yes i think so. I ve check everything. Anyway thank you for support.

I already check a few days ago with the diode mode (impedance) all the pins and they where correct. Caps C4810-18 where good but i changed them all anyway. Now i see that values on pins 22 and 23 are not correct (1,6 V each) and in the working board are 0 and 3,4V). The come directly from the...

I knew that if the value is LOW (of every signal with xxxxxxx_L) is not working, as the SMC_RESET_L.