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Yes i used good flux, it works for 2-3 days and then it starts beeping again. I am planning to replace ram chips. can i use ram chips from any donor board or do i need exact same board for ram transplant? And where can i buy stencils for reballing? I don't know what type of stencils are used for...

It magically started working next day.

the board came in with no wifi and no camera fault, it was due to some corrosion, and it started working, but then i took board out to clean flux and it stopped completely after cleaning it. pPP5V_S4RS3 is missing now, i checked pin 4 but there is no enable signal, traced and found that...

Okay, so back to square one, it started giving 3 beeps on start up again. i have already reflowed ram chips, so is there anything else that i can do?

It was ssd, used different ssd and it started charging. thanks for the help.

there are no voltages on amon and bmon, and is there suppose to be any voltage on pin 1 and 26? i don't get anything there. it starts from battery only

It was bad dc in board, now green light comes and computer runs on battery but it doesn't charge(it charges but doesn't show charging sign, but i can see percentage going up). one thing i noticed is that it charges with charging sign in recovery mode, but doesn't show charging sign in normal...

Pin 8 of u3740 is 3.3v, pin 3 is 3.3 pin 6 is 3.3 pin 4 is also 3.3. i have changed u3740 yesterday when i thought .9v on pin 2 was wrong, but nothing changed

Yeah it came in my mind as well, maybe ssd have high Sierra and board's firmware is not updated to apfs

U3740 voltages are fine, except pp3v3ssd_vmon. as name suggests it should have 3.3 volts but i get around 0.9 volts,(maybe its correct, but i don't have any working board to confirm it)it comes from a voltage divider of r3741(232k) and r3742(100k). edit: did some maths and i think there should...

hi, don't know the history of board as it was bought to use as donor board, but i noticed that 3v3_sus switch was missing, so i replaced it and it started working, but now it doesn't detect ssd. i have checked voltages to j3700 and SMC_OOB1_R2D_CONN_L is missing. the problem is it comes from...

Originally it gave 3 beeps on start up, so reflowed ram chips and it started working, but now when i connect genuine magsafe it doesn't charge or there's no green light, but if i connect aftermarket magsafe, there is green/amber light but battery doesn't charge. Can anyone tell what could be...

no liquid damage ppbus is 8.20v pp3v42 is 3.4 rtc is present smc_bc_acok is present smc resent is present. reflowed smc but nothing changed pp5v_s5 is not present but didn't checked it as i thought lets find why green light is missing

Ok, i will post results by tomorrow

Does it matters?? Even when nothing is connected it, spins fast

Checked this board under microscope and found pull down resistor of u3990 was corroded, replaced it and it worked fine until i removed its heat sink to apply thermal paste. The fans started spinning fast after i assembled it back. ran asd and it showed ta0p tc0p th0p tm0p failed smc i/o. i...

It beeps between 23 and 24 and its beeps continuously and value does not climb

Its 820-2796. I will post voltages in few hours. There's no short on ppbus_g3h but i have noticed that pin 23/24 of isl6259 have very low resistance and multi-meter beeps on diode mode. I have replaced chip and q7030 but nothing changed

Have someone found any solutions yet?

Hi, i am diagnosing macbook air, it have no pp3v42 and ppbus_g3h. my question is that can ppbus_g3h present without pp3v42? initially ppbus_g3h was present but then when i replaced lt3470a and powered board on, smoke came out of l7030 and ppbus_g3h stopped working, since then i have removed...