Macbook A1466 820-00165 PPBUS

[Instafixx]

Initially PPBUS was 8.15v.
Checked SMC was already reballed.
Replaced SMC. Now PPBUS is 8.6V but board wont turn on.
On the AMP Meter initially it spikes to 500-600 amps twice and then settles at 30amp.

In SMC Bypass Fan Spins twice and then shut.

SMC AVREF and SMC RESET L

PP5v_S4 also absent.

SMC_MANUAL_RST_L stuck at 2.8V

 

[2informaticos]

Do you get pulse on all coils?

 

[Instafixx]

No Pulse at all.

 

[2informaticos]

Check that in SMC bypass.
If fan tries to spin at least 5V coil must pulse.

 

[Instafixx]

No Fan Spin in SMC Bypass. PP5v_S4RS3 is 0V stable

 

[2informaticos]

"In SMC Bypass Fan Spins twice"
???

 

[Instafixx]

Now it doesnt !!

 

[2informaticos]

PM_PWRBTN_L drops when trigger SMC_ONOFF_L?
PM_RSMRST_L stays high always?

 

[Instafixx]

PM_PWRBTN_L does not drops when trigger SMC_ONOFF_L
Yes. PM_RSMRST_L stays high always

 

[Instafixx]

I replaced the SMC. Now there is pulse at PM_PWRBTN_L when SMC_ONOFF_L is trigerred

Amp Draw is same. Spiked to 600-700 amps twice then settles at 30 amps.

Now Fan Spins Twice in SMC. Bypass Mode.

I get pulse twice at PP5v_s4 and other coils in correspondence with the fan spin.