820-3662 missing S4 enable - stuck in S5 state

[mattpd]

Clean board, no liquid.

It has green/orange light.

PP3v3_S5 and PP5v_S5 are present.

No S4 (or S3 or S0) rails are present.

No shorts detected on any S4, S3, or S0 rails.

Missing PM_SLP_S5_L and SMC_S4_WAKESRC_EN which are required to enable S4 rails.

Trying to figure out why these two signals are missing...

ppbus_g3h = 12.57
PPVIN_S5_HS_COMPUTING_ISNS = 12.57
PPVIN_S5_HS_OTHER3V3_ISNS = 12.57
PPVIN_S5_HS_OTHER5V_ISNS = 12.57
PP3V42_G3H = 3.44
PPVRTC_G3H = 3.34
PP5V_S5 = 5.04
PP5V_S4 = 0v no short
pp5v_s3 = 0v no short
pp5v_s0 - 0v no short
pp3v3_s5 = 3.34v
pp3v3_s4 = 0v no short
pp3v3_s3 = 0v no short
pp3v3_s0 = 0v no short
pp3v3_sus = 3.34
PM_SYSRST_L = 0v
PM_BATLOW_L = 0v
PM_PWRBTN_L = 3.42
PM_RSMRST_L = 3v
PM_SLP_SUS_L = 3.4v
SMC_ADAPTER_EN = 3.4v
SMC_PM_G2_EN = 3.43v
SMC_S4_WAKESRC_EN = 0v
PM_SLP_S5_L = 0v
PM_PCH_SYS_PWROK = 0v
PM_PCH_PWROK = 0v
PM_DSW_PWRGD = 3.43v
PCH_DSWVRMEN = 3.23v

EDIT: Are batteries required for this model to start? I hooked up battery since BATLOW was missing and now I get fan spin... No display and no chime though...

[piernov]

Re: 820-3662 missing S4 enable - stuck in S5 state

PM_BATLOW_L = 0v → Means you are not using a good Magsafe2 85W.

[mattpd]

Re: 820-3662 missing S4 enable - stuck in S5 state

PM_BATLOW_L = 0v → Means you are not using a good Magsafe2 85W.

Thanks again Piernov. It took me half a day to realize my mistake.

[Techtiger]

Re: 820-3662 missing S4 enable - stuck in S5 state

PM_BATLOW_L = 0v → Means you are not using a good Magsafe2 85W.

Good job 👏

[Pedro147]

Re: 820-3662 missing S4 enable - stuck in S5 state

That's the only type of help that @Piernov gives 😉

[mcplslg123]

Re: 820-3662 missing S4 enable - stuck in S5 state

@Piernov is one of the brightest mind in this forum. I admire his advises and knowledge. Have learnt a lot from him.

[marce002]

Re: 820-3662 missing S4 enable - stuck in S5 state

Im using magsafe 2 (cable only ) attached to a power supply...i have green and then amber led in my cable but BATLOW = 0v ... what it mean ? That need to debug the board with an original charger? And no pwer bench?

[M4n0l0307]

Re: 820-3662 missing S4 enable - stuck in S5 state

PM_BATLOW_L = 0v → Means you are not using a good Magsafe2 85W.

Thank you !

[tom177]

Re: 820-3662 missing S4 enable - stuck in S5 state

PM_BATLOW_L = 0v → Means you are not using a good Magsafe2 85W.

You got a beer from me.
Where to send ?

[mustafa4444]

Re: 820-3662 missing S4 enable - stuck in S5 state

dear Piernov,
i work on mac's. Repair mb. Voltages and main section fault finding is not big issue. My heart pains when i get stuck when i cannot locate fault because i don't know step by step signal processing. Pls can i get this very important knowledge regarding signals , from first to last. Basically we know like first S5 then S4 then S3 then S0. In betwen there are many signals . Designer point of view. Please help and support me. Really nothing better than this knowledge. Thank and eagerly waiting for the reply.

[piernov]

Re: 820-3662 missing S4 enable - stuck in S5 state

https://logi.wiki/index.php/G3_to_S3..._and_Broadwell
https://logi.wiki/index.php/Bootup_Signal_Order