Recent content by hascanio

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 ?