MacBook Pro Retina Late 2013 shows light, fan spin but no chime

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

L7095, pin # 2.

If that is indeed 3v42, then suggest to check the voltage on each coil on the logic board. Report any low / 0 volt readings.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

PP3V42_G3H_REG tested on L7095 pin 2: 3.42V

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

Can you help me make these readings?

Many thanks.

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Attach a usb mouse. Allow the board to power up and wait a minute or so. Does the usb mouse light up?

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

I do not have any wired USB mouse

I plug in keyboard with USB receiver.

I can see that keyboard is connecting to USB receiver as connecting light goes out.

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Measure the voltage of PM_BATLOW_L .

Check it @ Q3000 - pin # 3.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

00.8 on 200m mode.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Sorry is bad reading, I measured at R2140 pin 1 and showing 3.3V

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

I measured at R2140 pin 1 and showing 3.3V

Correction: R1240 - good voltage.

Confirm the voltage again of PM_SLP_S4_L

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

3.3v.

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Good.

See attached. Check each of the signals from this chart to confirm which one is still at '0' logic level.

When each is '1' -> the board should boot = S0 power state.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

Please can you help me understand this chart and what I am testing, please for your help.

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Search for each of the signal (net) names in the attached chart.

Measure their values and post them here. If the voltage is ~3v = '1'; then this is a good reading.

If the voltage is low = '0' -> stopping your board from booting up.

For the S0 power state, each of the highlighted signals need to be '1'.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Isolate_cpu mem_l: 3.3v
plt reset_l: 3.33v
pm_slp_s3_l: 0.00v
pm_slp_s4_l: 3.33v
cpu_mem_reset_l: 1.35v
mem_reset_l: 1.35v
memvtt_en: 0.01v
cpuvddq_en: 0.00v

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

I am not sure what happened but I re-tested all above again and now:

Isolate_cpu mem_l: 0.00V
plt reset_l: 0.00V
pm_slp_s3_l: 0.00V
pm_slp_s4_l: 0.00V
cpu_mem_reset_l: 0.00V
mem_reset_l: 0.00V
memvtt_en: 0.00V
cpuvddq_en: 0.00V

[mon2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Will have to start from the beginning.

Check PPBUS_G3H.

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

will have to start from the beginning.

Check ppbus_g3h.

12.59v

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

ALL_SYS_PWRGD is measuring as 3.19V, how can system not boot?

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Now fan started spinning again!

It's spinning like jet engine when power connected but still no boot

[Gigabit2]

Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Okay with fan spinning ALL_SYS_PWRGD 3.19V.

But it's intermittent, now fan stopped spinning and ALL_SYS_PWRGD 0.00V!

So it looks like some fault on the board? But even when ALL_SYS_PWRGD is good, still no boot. Seems like stuck in SMC_BYPASS with full fan spin like jet engine?