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Old 05-31-2021, 11:34 PM   #1
Terence Ng
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Default MacBook A1425 (820-3462) No green light

Received an MacBook A1425 with can't power on...No green/orange led light. Some measurement has been taken as below:-

> SYS_ONEWIRE: ~3.4V
> SMC_BC_ACOK_VCC : ~ 3.4V
> ADAPTER_SENSE: ~3.4V
> PPBUS_G3H : ~2V
* No shorted to ground
* Remove F7040 voltage remain the same ~2V
> SMC_RESET_L : ~3.4V
> PP3V42_G3H_CHGR: ~3.4V
> PP5V1_CHGR_VDD,PP5V1_CHGR_VDDP: ~5.48V
> CHGR_DCIN_D_R: ~16.5V
> CHGR_AGATE: ~6.8V
> CHGR_SGATE: ~16.2V
> PPDCIN_G3H_INRUSH: ~16.4V

Looks U7000 faulty.. need help to double confirm?
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Old 06-01-2021, 05:17 AM   #2
mon2
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Default Re: MacBook A1425 (820-3462) No green light

Hi Terence.

1) voltage @ PPDCIN_G3H_CHGR ?

2) voltage @ CHGR_UGATE ?

3) voltage @ CHGR_LGATE ?

4) voltage @ CHGR_ACOK ?
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Old 06-01-2021, 06:43 AM   #3
Terence Ng
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Default Re: MacBook A1425 (820-3462) No green light

1) voltage @ PPDCIN_G3H_CHGR ?
>> 18.2V
2) voltage @ CHGR_UGATE ?
>> 0V
3) voltage @ CHGR_LGATE ?
>> 0V
4) voltage @ CHGR_ACOK ?
>> 3.4V

Last edited by Terence Ng; 06-01-2021 at 07:02 AM..
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Old 06-01-2021, 07:20 AM   #4
mon2
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Default Re: MacBook A1425 (820-3462) No green light

My bet is on a faulty U7000.
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Old 06-01-2021, 07:27 AM   #5
Terence Ng
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Default Re: MacBook A1425 (820-3462) No green light

Hi...
Noted with thanks...
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