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i don’t know the history of this board…I’m pretty sure that u3900 was touched/changed (i don’t know why) Motherboard boot with “no disk error.” Tried another disk, same error! It can’t see usb bootable from both usb USB stick light stay on fixed As soon as i try to boot in Recovery and...

Ahhhhhhhhh ok! Now I’m under stand!

So how can i reprogram it, if machine doesn't boot? in the istruction it says Insert your USB stick, then power on the device whilst holding Option ⌥

With original smc i have not s5pwrgood … with the other smc bought for new, i have 3v on s5 pwrgood, but i have 0,9 on PP1V2_S5_SMC_VDD

How to flash is macbook is dead ?

Problem is to find a donor board? Could I take from 820-2796 ??

i will resolder the old smc....i'm going crazy...with this smc i have S5_PWRGD...but smc doesn't work...

i will go crazy...i've soldered another smc..now i have 3,2 on the other side of r8141 but no power led on magsafe... i have even pwrbtn_l 3,4V!!!!! ppbus_g3h is 8,16, PP3V3_S5_SMC_VDDA 3,4 sysonewire 3v (should be 3,4?!) PP1V2_S5_SMC_VDD 0,9 v!?!?!?!? should be 1,2? (line is not shorted)

tried another u7501, still the same

What do you think: is it better to change u7501 with another one or isolate the pin?

Just to understand: why do you think about u7501? I’ve seen that this line goes under smc also!

yes

PM_PWRBTN_L is 0,3v but it should go to 0,3v when triggered! r1405 is 1k, i have 3,3v on the other side...so i don't understand SMC_ONOFF_L. 3,4v SMC_RESET_L 3,2v

ok now with another u7501 i have pp3v3_s5 0v on PM_DSW_PWRGD SMC_S5_PWRGD_VIN 3,3v S5_PWRGD not present 0v on PP3V3_SUS 0,3v on PM_PWRBTN_L

0,011!! FUCK! how is it possible

pp5v_s5 is not shorted.

U7501 basic voltages; 23, 22, 12, 13, 29, 21: 8,5 / 3,3 / 3,4 / 0 /0,7 /3,3

R7563 15 ohm R7560 9,5k R7561 7k same readings of another motherboard

i'm going crazy..i think i will commit suicide....pleas 2informaticos...forgive me for all this chaos.... i have soldered a BRAND NEW U7501...now i miss some voltages...help :( 3V3_S5 not present 3V3_Sus not present P3V3SUS_EN 0v PM_SLP_SUS_L 0v (no short) PM_PWRBTN_L 0 v SPIROM_USE_MLB 0v...

3V3_S5 is 2,8v r7560/1 1,4v r7563 2,8v