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05-31-2021, 11:34 PM
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#1 |
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New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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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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06-01-2021, 05:17 AM
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#2 |
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Badcaps Veteran
Join Date: Dec 2019
City & State: Windsor, Ontario
My Country: Canada
Line Voltage: 110VAC
I'm a: Knowledge Seeker
Posts: 4,127
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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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06-01-2021, 06:43 AM
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#3 |
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New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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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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06-01-2021, 07:20 AM
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#4 |
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Badcaps Veteran
Join Date: Dec 2019
City & State: Windsor, Ontario
My Country: Canada
Line Voltage: 110VAC
I'm a: Knowledge Seeker
Posts: 4,127
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Re: MacBook A1425 (820-3462) No green light
My bet is on a faulty U7000.
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06-01-2021, 07:27 AM
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#5 |
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New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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Re: MacBook A1425 (820-3462) No green light
Hi...
Noted with thanks... |
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