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Old 06-26-2022, 12:05 PM   #1
Gigabit2
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Default MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi all,

I have a MacBook Pro Late 2013 Retina.

When plugged in, it shows an orange light on the charger (without battery connected) and the fans spin. But after about 15 seconds they stop and then never spin up again. No chimes and nothing on the display.

There is impact damage to the corners of the casing and one of the USB ports is therefore warped. But the logic board itself looks okay from visual inspection.

PPBUS_G3H showing 12.58V at all times.

Can anyone help?
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Old 06-26-2022, 02:47 PM   #2
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Remove all power. Meter in resistance mode.

Check the resistance to ground of each pin on the battery connector.

Post the readings and scale used on the meter.
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Old 07-03-2022, 10:36 AM   #3
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

From left to right.

Pin 1: 00.5 - 200 mode
Pin 2: 00.4 - 200 mode
Pin 3: 00.6 - 200 mode
Pin 4: 00.5 - 200 mode
Pin 5: 10.00 - 20k mode
Pin 6: 85.8 - 200k mode
Pin 7: 85.5 - 200k mode
Pin 8: 1. - on all modes
Pin 9: 1. - on all modes
Pin 10: 1. - on all modes
Pin 11: 1 - on all modes
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Old 07-03-2022, 10:49 AM   #4
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Post the 820-xxxx logic board #.
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Old 07-03-2022, 10:54 AM   #5
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

820-3787-A
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Old 07-03-2022, 11:05 AM   #6
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Post the voltage readings of each battery pin (with the battery connected).
Attached Images
File Type: png J7050.png (68.0 KB, 23 views)
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Old 07-07-2022, 08:07 AM   #7
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Pin 1: 11.33V
Pin 2: 11.33V
Pin 3: 11.33V
Pin 4: 11.33V
Pin 5: ?
Pin 6: ?
Pin 7: 0.03V
Pin 8: GND
Pin 9: GND
Pin 10: GND
Pin 11: GND
Pin 12: 11.33V
Pin 13: 11.33V
Pin 14: 11.33V
Pin 15: 11.33V
Pin 16: UNCONNECTED
Pin 17: UNCONNECTED
Pin 18: 0.03V
Pin 19: GND
Pin 20: GND
Pin 21 GND
Pin 22: GND
Pin 23: UNCONNCTED
Pin 24: UNCONNECTED

Not sure how I do the others as the connector blocks the pins?
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Old 07-07-2022, 08:28 AM   #8
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

What are the voltage readings on pins 5 & 6 ?
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Old 07-07-2022, 09:14 AM   #9
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

How can I measure these? The pins are covered by the connector with it plugged in.
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Old 07-07-2022, 11:38 AM   #10
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Measure @ D7050 ESD diodes.
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Old 07-09-2022, 02:27 AM   #11
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Hi mon2,

Pin 5: 3.40V changing to 3.33V every second.
Pin 6: 3.40V changing to 3.38V every second.
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Old 07-09-2022, 05:31 AM   #12
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Voltages are good.

So the logic board is power cycling every second?
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Old 07-09-2022, 05:32 AM   #13
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

No that is just what I observed on reading.

What is happening is that board switches on with fan spin, fan spins for about 15 seconds and then shuts off. No chime or display.
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Old 07-09-2022, 05:49 AM   #14
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Ok but after it shuts off, does it turn on again and repeat this on/off/on cycle?
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Old 07-09-2022, 05:49 AM   #15
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

No it stays off.
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Old 07-09-2022, 06:16 AM   #16
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

See here:

https://boards.rossmanngroup.com/thr...a-second.5583/
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Old 07-09-2022, 08:22 AM   #17
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

But it is not a second it spins for @mon2, it is whole 15 seconds of fan spin! Then powers off!
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Old 07-09-2022, 09:37 AM   #18
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Ok. Meter in DC volts scale.

What are the voltage readings for the following ?

SMBUS_SMC_0_S0_SCL
SMBUS_SMC_0_S0_SDA
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Old 07-09-2022, 09:50 AM   #19
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

Apply lots of flux on U9300 = PPVCORE_S0_GFX_REG regulator.

Reflow this component to fix up every solder joint on this component - there is a long history of faults linked to this device.
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File Type: png U9300.png (190.2 KB, 6 views)
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Old 07-09-2022, 11:28 AM   #20
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Default Re: MacBook Pro Retina Late 2013 shows light, fan spin but no chime

SMBUS_SMC_0_S0_SCL: 3.32V going to 3.29V every second
SMBUS_SMC_0_S0_SDA: 3.31V going to 3.28V every second
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